Here's a fishy clue for you (7)

I believe the answer is:

piscine

I'm a little stuck... Click here to teach me more about this clue!

'here's' is the definition.
Although both the answer and definition are adjectives, I can't understand how one could define the other.

I can't explain the remainder 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.

Want a hint initially instead of a full solution? Install my app