Some Aussies taking an afternoon nap (6)
I believe the answer is:
siesta
'afternoon nap' is the definition.
(I've seen this before)
'some aussies taking an' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'SIESTA' is hidden in the letters of 'aussies taking an'.
(Other definitions for siesta that I've seen before include "PM snooze" , "Seat is found for a Spanish rest period" , "After lunch nap" , "Rest of Spain" , "Afternoon rest" .)