Put on a ship taking back a native of Australia (6)
I believe the answer is:
assume
'put on' is the definition.
(I've seen this in another clue)
'a ship taking back a native of australia' is the wordplay.
'ship' becomes 'SS' (prefix in ship names eg SS Great Britain).
'taking' is a charade indicator (letters next to each other).
'back' says the letters should be written in reverse.
'a native of australia' becomes 'emu' (I've seen this in another clue).
'emu' in reverse letter order is 'ume'.
'a'+'ss'+'ume'='ASSUME'
(Other definitions for assume that I've seen before include "Dark brown fur" , "Claim without justification" , "Suppose; put on" , "Take to be the case" , "Wrongly take" .)