Bitter cabin crew finally cut out (7)
I believe the answer is:
acerbic
'bitter' is the definition.
(synonyms)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for acerbic that I've seen before include "Acrimonious" , "Cutting" , "Biting" , "Tasting sour or caustic in speech" , "Astringent; sour" .)