Bottle used for pre-dinner vermouth (5)
I believe the answer is:
nerve
'bottle' is the definition.
(both can mean courage)
'used for pre-dinner vermouth' is the wordplay.
'used for' indicates the answer is hidden within the clue.
'NERVE' is hidden in the letters of 'pre dinner vermouth'.
(Other definitions for nerve that I've seen before include "Courage - impertinence" , "Courage - cheek" , "Bundle of fibres in the body (5)" , "Bodily fibre that communicates sensations" , "Cheek; self-possession" .)