Very little time: Australia back in race (4)
I believe the answer is:
zoom
'race' is the definition.
(both can mean to move quickly)
'very little time australia back' is the wordplay.
'very little time' becomes 'mo' (short period of time).
'australia' becomes 'oz' (informal name for Australia).
'back' says the letters should be written backwards.
'mo'+'oz'='mooz'
'mooz' reversed gives 'ZOOM'.
'in' acts as a link.
(Other definitions for zoom that I've seen before include "pelt" , "Lens to move into a close-up" , "race" , "Change focus smoothly" , "cinematic technique?" .)