Antelopes put back in container, when picked up (7)
I believe the answer is:
reeboks
'antelopes' is the definition.
(reeboks are South African antelopes)
'put back in container when picked up' is the wordplay.
'put back in container' becomes 're-box' (put in a box again).
'when picked up' shows a homophone (sound like) (pick up can mean to hear).
'rebox' sounds like 'REEBOKS'.
(Other definitions for reeboks that I've seen before include "trainers" , "Animals" .)