Fish found in coastal area when sun goes down (8)
I believe the answer is:
seahorse
'sun goes down' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.
'fish found in coastal area' is the wordplay.
'fish' becomes 'sea fish' (sea fish is a kind of fish).
'found in coastal area' becomes 'horse' (I can't justify this - if you can you should give a lot more credence to this answer).
'sea'+'horse'='SEAHORSE'
'when' is the link.
Can you help me to learn more?
(Other definitions for seahorse that I've seen before include "marine creature" , "Fish" , "swimmer" , "that's found in the main" .)