Cryptic Crossword 1-9

Theme: All thematic clues contain a reference to a US president, as indicated by “#nn” where nn is a number, it represents a US president for example #46 refer to Biden (the 46^th president of US)

Across:

1 Pierce, DD as in #14 (thematic reference to 14th US president) and bore as in drill

4 Etchings, Watercolors (def), etch (brand), naughty (anagram of) sign

10 Impromptu, I'm (admitting), prompt (urge), u (you), snap (def)

11 Torso, Trunk (def), hiding (hidden), rest is fodder

12 Grant, DD as in award and #18 (18th president of US)

13 Expurgate, Expat (refugee), bizarre (anagram of) expat + urge, clean up (def)

14 Slipped, Sipped (guzzled), about (container), l (liter), stumbled (def)

16 Toil, T (model), oil (painting), web (def)

19 Grot, buried (hidden), cave (def), rest is fodder

21 Hosanna, Bravo (def), for the audience (homophone), who's (who is), Anna (Karenina), hosanna sounds like "who's Anna"

24 Almshouse, Broken (anagram of) small + house (dwelling), without (deletion of) l (money), rest is def

25 Swept, DD as in past tense of executing sweep shot in cricket and as in bowled

26 Alums, DD as in ex-students and chemical compounds of Al and K

27 Alabaster, compound (anagram of) Albert's + a (advanced) + a (atomic), translucent gypsum (def)

28 Spheroid, Egg shaped (def), sp (species), hero (icon), id (genius)

29 Wedded, Matched (def), DD (Doctor), dividing (insertion), weed (pot)

Down:

1 Priggish, Self-righteous (def), piggish (ravenous), around (container), R (queen)

2 Emphasis, E (English), MP (politician), has (has), IS (Icelandic), accent (def)

3 Croat, European (def), R (King), wearing (insertion), coat (fur)

5 Trumpet, Broadcast (def), Trump (US president #45), ET (alien)

6 Hit-or-miss, Slapdash (def), hit (blockbuster), or (or), miss (bomb)

7 Normal, Typical (def), Norm + Al (pair of SNL actors)

8 Spoken, Unwritten (def), poke (name), in (insertion), SN (partnership as in Bridge partners)

9 Append, Add (def), app (starter), end (finish)

15 Purchaser, almost (delete last letter of) pure (straight), chaser (nightcap), consumer (def)

17 Indebted, Owing gratitude (def), Biden (#46th President of US), bats (anagram of) Biden + t (the) + Ed (journalist)

18 Tattered, Ratty (def), shabbily (anagram of), T (model) + treated

20 Tsunami, Tidal wave (def), some (hidden), rest is fodder

21 Hyenas, Hayes (#19 president of US), regulated (anagram of) Hayes + n (national), scavengers (def)

22 Madams, M (Bond's boss), Adams (#2 President of US), ladies (def)

23 Ambush, Surprise (def), Am (American), Bush (#41 President of US)

25 Spade, DD as in garden tool for digging and suit in a deck of cards