Here's a fishy clue for you (7)

I believe the answer is:

piscine

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'here's' is the definition.
Although both the answer and definition are adjectives, I cannot see how they can define each other.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for piscine that I've seen before include "Resembling a fish" , "about aquatic life" .)

I've seen this clue in the Evening Standard.

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