Issue of US magazine is returned (4)
I believe the answer is:
emit
'issue' is the definition.
(both can mean to give out or radiate)
'us magazine is returned' is the wordplay.
'us magazine' becomes 'time' (US weekly magazine).
'is returned' shows that the letters should be reversed in order.
'time' in reverse letter order is 'EMIT'.
'of' acts as a link.
(Other definitions for emit that I've seen before include "Give out or put forth" , "'Give off, odour say (4)'" , "Give off, gas say" , "shed" , "Broadcast" .)