Somehow get a fish in a naval battle (3,5)

I believe the answer is:

sea fight

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'a naval battle' is the definition.
Both the definition and answer are singular nouns.
Perhaps you can see an association between them that I can't see?

'somehow get a fish' is the wordplay.
'somehow' indicates an anagram.
'get'+'a'+'fish'='getafish'
'getafish' is an anagram of 'SEA-FIGHT'.

'in' is the link.

Can you help me to learn more?

I've seen this clue in The Irish Independent.

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