Wrench, necessitating whiskey and recuperation! (5)
I believe the answer is:
wrest
'wrench' is the definition.
(I've seen this before)
'whiskey and recuperation' is the wordplay.
'whiskey' becomes 'w' (alpha bravo charlie delta ...).
'and' is a charade indicator (letters next to each other).
'recuperation' becomes 'rest' (I can't explain this - if you can you should give a lot more credence to this answer).
'w'+'rest'='WREST'
'necessitating' acts as a link.
I am not very happy about this link. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for wrest that I've seen before include "Seize (control)" , "Seize by forceful means" , "Snatch from" , "Take away by force" , "With difficulty obtain" .)