Swimmer's new tutor (5)

I believe the answer is:

trout

'swimmer's' is the definition.
(trout is a kind of fish)

'new tutor' is the wordplay.
'new' indicates an anagram.
'tutor' is an anagram of 'TROUT'.

(Other definitions for trout that I've seen before include "one of a noted quintet" , "air" , "Game fish related to salmon" , "Tutor (anag.)" , "Freshwater game fish" .)

I've seen this clue in The Mirror.

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