Gangs said to go round looking for sex (6)
I believe the answer is:
cruise
'go round looking for sex' is the definition.
(to cruise is to find strangers to have sex with)
'gangs said' is the wordplay.
'gangs' becomes 'crews' ('crew' can be a synonym of 'gang').
'said' shows a homophone (sound like).
'crews' is a homophone of 'CRUISE'.
'to' is the link.
(Other definitions for cruise that I've seen before include "Tom, say" , "Shipboard holiday" , "Sail smoothly" , "Holiday afloat - Kidman's ex" , "Sail on a ship" .)