Fish with a deep voice? (4)
I believe the answer is:
bass
I believe this is a double definition.
'fish' is the first definition.
(bass is a kind of fish)
'deep voice?' is the second definition.
(I've seen this in another clue)
'with a' acts as a link.
(Other definitions for bass that I've seen before include "Sea fish; voice" , "Big percussion instrument" , "Low-pitched; a fish" , "Fish; vocalist" , "Very low - perch" .)