But one skater turns out to be an old comedian (6,6)

I believe the answer is:

buster keaton

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'be an old comedian' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'but one skater turns out' is the wordplay.
'turns out' indicates anagramming the letters.
'but'+'one'+'skater'='butoneskater'
'butoneskater' anagrammed gives 'BUSTER KEATON'.

'to' is the link.

Can you help me to learn more?

(Other definitions for buster keaton that I've seen before include "silent clown - with 21d" , "Broken statue (anag) - early film star" , "Comic" , "Silent screen star" , "US silent film star" .)

I've seen this clue in The Globe and Mail.

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