Quiet moment (4)
I believe the answer is:
lull
'quiet moment' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for lull that I've seen before include "Short period of quiet" , "Calm; allay (fears)" , "Calm - calm by deception" , "A quiet interlude as in storm" , "Put to sleep - respite" .)