Gesture with a heartless vote (4)
I believe the answer is:
wave
'gesture' is the definition.
(wave is a kind of gesture)
'with a heartless vote' is the wordplay.
'with' becomes 'w' (abbreviation**).
'heartless' means to remove the middle letters.
'vote' with its middle taken out is 've'.
'w'+'a'+'ve'='WAVE'
(Other definitions for wave that I've seen before include "Fasten; neckwear" , "It may be permanent or Mexican" , "Flourish" , "roller, perhaps" , "Breaker; hand gesture" .)