Revolver left after expression of delight (5)
I believe the answer is:
wheel
'revolver' is the definition.
(wheels revolve around)
'left after expression of delight' is the wordplay.
'left' becomes 'l' (common abbreviation).
'after' is a charade indicator (letters next to each other).
'expression of delight' becomes 'whee' (I've seen this in another clue).
'l' put after 'whee' is 'WHEEL'.
(Other definitions for wheel that I've seen before include "Rotary object - don't reinvent it" , "Turn round quickly" , "Revolutionary invention!" , "Change direction as if on an axis" , "Move in a circle" .)