Male deer in mist again (4)
I believe the answer is:
stag
'male deer' is the definition.
(I've seen this before)
'in mist again' is the wordplay.
'in' indicates a hidden word.
'STAG' is hidden within 'mist again'.
(Other definitions for stag that I've seen before include "Stock Exchange speculator standing" , "one may get in a rut" , "without female escort" , "Game - speculator" , "A fully-grown male deer" .)