A bunch of seamstresses sabotaging spinning jennies? (5)
I believe the answer is:
asses
'jennies?' is the definition.
(jenny is a kind of ass)
'a bunch of seamstresses sabotaging spinning' is the wordplay.
'a bunch of' says the answer is hidden in the clue (a bunch of letters in the clue).
'spinning' says the letters should be written backwards.
'sessa' is hidden within 'seamstresses sabotaging'.
'sessa' written backwards gives 'ASSES'.
(Other definitions for asses that I've seen before include "Dolts" , "Stupid people; Roman coins" , "More than one fool" , "Braying animals" , "Fools, quadrupeds" .)