In Oz, to get intimate with cricket captain (4)
I believe the answer is:
root
This clue is a double definition.
'in oz to get intimate with' is the first definition.
(Australian slang for sex)
'cricket captain' is the second definition.
(Joe Root MBE, English cricketer)
(Other definitions for root that I've seen before include "Underground part of a plant" , "Basic source or origin" , "Basic cause or origin" , "Origin; carrot perhaps" , "Turn up with the snout." .)