Temporary calm (4)
I believe the answer is:
lull
'temporary calm' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for lull that I've seen before include "Soothe; quiet interval" , "Cessation of activity (before a storm?)" , "Put to sleep - respite" , "A temporary pause as in storm" , "Make calm" .)