Fishes in shallow water (5)
I believe the answer is:
shoal
This clue could be a double definition.
'fishes in shallow' is the first definition.
'shoal' can be an answer for 'shallow' (synonyms). I'm not certain of the 'fishes in' bit.
'water' is the second definition.
(I know that shoal is a type of water)
Can you help me to learn more?
(Other definitions for shoal that I've seen before include "Swarm of fish" , "School of fish" , "A great number of fish swimming together" , "Fish grouped" , "shallow water" .)