Fish found around Howth Head and Belgium raised from reserves (3,5)

'reserves' is the definition.
The answer and definition can be both groups as well as being singular nouns.
Perhaps you can see an association between them that I can't see?

'fish found around howth head and belgium raised from' is the wordplay.
I cannot really understand how this works, but
'around' could be 'c' (abbreviation for 'circa') and 'c' is present in the answer.
'and' could be 'n' (common abbreviation for 'and') and 'n' is found within the answer.
'belgium' could be 'be' (I've seen this in other clues) and 'be' is found within the answer.
'from' could be 'e' (I've seen this in other clues) and 'e' is located in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?