Crossword Genius

Clever swimmer left Greek character in Wear (7)

Ross

I believe the answer is:

dolphin

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

'clever swimmer' is the definition.
(dolphins are highly intelligent)

'left greek character in wear' is the wordplay.
'left greek' becomes 'dolph' (I am not sure about this - if you are sure you should believe this answer much more).
'character in' indicates the central letters (I've seen 'characters in' mean this).
'wear' becomes 'mink' (mink is a kind of wear).
The centre of 'mink' is 'in'.
'dolph'+'in'='DOLPHIN'

Can you help me to learn more?

(Other definitions for dolphin that I've seen before include "Marine mammal with an elongated beak-like head" , "Sea mammal like large porpoise, friendly towards people" , "Small sociable whale" , "Sociable sea mammal, sacred in ancient Greece" , "Sea-mammal" .)

I've seen this clue in The Times.
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