Across
6 It’s fashionable breaking tea saucer? (5)
7 Scrap French enterprise (8)
10 Critic at sea with keyboard instrument (7)
11 Put up commander with col. (7)
12 Number 1, tide turned by newsmagazine (7)
13 Mercy home? (7)
14 Thematic? me? possibly. The answers to clues 7a, 11a, 13a, 21a, 23a, 27a are terms used in this field of study (11)
19 Rapture say its French perversion (7)
21 Protest forever? That's common. (7)
23 Affair for leader? (7)
25 Women snap at, or men take to booze, to vent internal anguish (7)
26 Omission of French and allow no one to return (8)
27 One French individual working for confederacy (5)
Down
1 One in giant doubt about light yet strong metal (8)
2 Don't like it? Swap it, I don't mind providing deer (6)
3 Showing audacity, Jeff, Ron, Tery and Joe blew the whistle against their dictatorial boss (10)
4 New trend for G-man (4)
5 Degree in punk and metal? (6)
6 Caltech dropping student work for prestige (6)
8 I nap upside down after a peg. Besides that, I am a drum? (7)
9 American primitive measure on loansharking (5)
13 Detention for uninitiated water operated prong (10)
15 Slander from the French in a way (7)
16 Cheap crack for BBQ fare (8)
17 Secretary with no pace? (5)
18 Subatomic particle from atom particle collider and not pellet from BB gun round (6)
20 Lavish exhibition for woman who lost her husband (6)
22 Sad, not crossed after angry reprimand (6)
24 Orderly word related to the theme of this puzzle (4)