Piscine is rather cold (6)
I believe the answer is:
offish
I believe this is a double definition.
'piscine' is the first definition.
(of fish - word definition)
'rather cold' is the second definition.
'is' acts as a link.
(Another definition for offish that I've seen is " Aloof, distant in manner".)
I've seen this clue in The Guardian.
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