Degenerate men get revolver (5)
I believe the answer is:
rotor
'revolver' is the definition.
(something which revolves)
'degenerate men' is the wordplay.
'degenerate' becomes 'rot' (rotting is a kind of degenerating).
'men' becomes 'OR' (military abbreviation for Other Ranks).
'rot'+'or'='ROTOR'
'get' is the link.
(Other definitions for rotor that I've seen before include "Hub with radiating blades" , "US state South of L. Erie" , "part of chopper" , "Revolving arm in machine" , "System of turning helicopter blades" .)