Crossword Genius

Swimmer up mountain gets chill (6)

Ross

I believe the answer is:

plaice

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

'up mountain gets chill' is the wordplay.
'up' is a reversal indicator (in down clue: letters go upwards).
'mountain' becomes 'alp' (the Alps are a mountain range).
'gets' is a charade indicator (letters next to each other).
'chill' becomes 'ice' (icing is a kind of chilling).
'alp' reversed gives 'pla'.
'pla'+'ice'='PLAICE'

(Other definitions for plaice that I've seen before include "Flatfish; sounds like put" , "Ice, pal, will catch this fish" , "A succulent flat-fish" , "A fish; sounds like put" , "Flatfish, valued as food" .)

I've seen this clue in The Sun.
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