Issue the enemy raised? (4)
I believe the answer is:
emit
'issue' is the definition.
(both can mean to give out or radiate)
'enemy raised?' is the wordplay.
'enemy' becomes 'time' (reference to the phrase 'time is the enemy').
'raised?' says the letters should be written in reverse (going up in a down clue).
'time' written backwards gives 'EMIT'.
'the' acts as a link.
(Other definitions for emit that I've seen before include "Exhale" , "Conductor; telegram (US)" , "Let out" , "Exude" , "Give off or discharge" .)