Island group gathers cricket side — it’s pressing! (7)
I believe the answer is:
ironing
'pressing' is the definition.
(ironing is a kind of pressing)
'island group gathers cricket side' is the wordplay.
'island' becomes 'i'.
'group' becomes 'ring'.
'gathers' means one lot of letters goes inside another.
'cricket side' becomes 'on'.
'ring' placed around 'on' is 'roning'.
'i'+'roning'='IRONING'
'it's' acts as a link.
(Other definitions for ironing that I've seen before include "Making clothes smooth" , "Smoothing - removing wrinkles" , "having pressing business" , "Pressing clothes" , "Levelling out" .)