3d) Being 16, they would produce these kisses with no upset (5) S_N_S 16 = "singers" Must be "songs", but can't see why. 14a) Pay attention to addendum by saint (4) -S-T 25a) 21 riots in the capitals...
6d) Young firm flower in Surrey isn't going to seed (7,8)
S-N-I-E/-N---T-Y
24a) Share a third of riches hoarded by old twins, woman allocating what's left(9)
E-E---R-X...
5a) America after success to bridge a gap (6) -I-T-S "rictus"?! 9a) Where women were confined by gaolers, I suspect (8) S-R-G-I- 22d) Red setters after headless chicken (6) -N-E-S Must be "engels",...
13a) Advanced case of athlete's foot is a problem (2-4) -I/-E-H 22d) State in which cells are suspended (6) -L-S-- "plasma??!" 30a) Tout for setter, perhaps (6) ---K-R "hawker?!". Crossword setter is...
This crossword has some undefined solutions with the theme of "a poison".
17a) As if it's briefly presented (7)
-R-E-I-
Must be "arsenic", but I can't see how....
24a) Freeze alloy with metals to make time capsule (3,2)
--E/-P
"ice up"?
17d) Proper interaction with threat as article of faith (8)
-F-(I)-I-L
"official"?...
6d) Articles about fool touring island in Caribbean (9)
Anguilla is an island in the Caribbean.
AN-GU(I)LL-AN maybe?
21a) Separate fish head turned up (6)
W---O-...