Reportedly, gangs drift along (6)
I believe the answer is:
cruise
'drift along' is the definition.
'cruise' can be an answer for 'drift' (thesaurus). I am unsure of the 'along' bit.
'reportedly gangs' is the wordplay.
'reportedly' shows a homophone (sound like).
'gangs' becomes 'crews' ('crew' can be a synonym of 'gang').
'crews' sounds like 'CRUISE'.
Can you help me to learn more?
(Other definitions for cruise that I've seen before include "Ocean trip taken for pleasure" , "Voyage for holiday makers" , "Sail smoothly" , "Holiday at sea" , "Holiday on liner" .)