Issue US magazine promoted (4)
I believe the answer is:
emit
'issue' is the definition.
(both can mean to give out or radiate)
'us magazine promoted' is the wordplay.
'us magazine' becomes 'time' (US weekly magazine).
'promoted' is a reversal indicator (going up, in a down clue).
'time' in reverse letter order is 'EMIT'.
(Other definitions for emit that I've seen before include "'Give out, light say (4)'" , "Let out" , "Produce and discharge" , "Give off, gas say" , "Exude" .)