Give out American magazine in revolution (4)
I believe the answer is:
emit
'give out' is the definition.
('emit' can be a synonym of 'give out')
'american magazine in revolution' is the wordplay.
'american magazine' becomes 'time'.
'in revolution' shows that the letters should be reversed in order.
'time' in reverse letter order is 'EMIT'.
(Other definitions for emit that I've seen before include "Send forth" , "Let out" , "Discharge - utter" , "'Give off, odour say (4)'" , "Release" .)