Revolver to go off above soldiers (5)
I believe the answer is:
rotor
'revolver' is the definition.
(something which revolves)
'go off above soldiers' is the wordplay.
'go off' becomes 'rot' (I've seen this before).
'above' is a charade indicator (letters next to each other).
'soldiers' becomes 'or' (Other Rank).
'rot'+'or'='ROTOR'
'to' is the link.
(Other definitions for rotor that I've seen before include "Helicopter lifter" , "Revolver" , "device for lifting a chopper" , "Helicopter vane" , "Something mechanical" .)