Cold fish (5)
I believe the answer is:
bleak
This clue is a double definition.
'cold' is the first definition.
(I've seen this before)
'fish' is the second definition.
(I've seen this before)
(Other definitions for bleak that I've seen before include "Dreary; cold, miserable" , "Cold and unwelcoming" , "Gloomy" , "Austere" , "Dreary; fish" .)