Leave group, cricket side (3,3)
I believe the answer is:
set off
'leave' is the definition.
(setting off is a kind of leaving)
'group cricket side' is the wordplay.
'group' becomes 'set' (set is a kind of group).
'cricket side' becomes 'off'.
'set'+'off'='SET-OFF'
(Other definitions for set off that I've seen before include "Leave - explode" , "'Leave on a journey (3,3)'" , "Leave on a journey or put in motion" , "Explode; start journey" , "Begin journey or detonate bomb" .)