Key choice about Winter Olympics discipline (3,6)

I believe the answer is:

ice hockey

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'winter olympics discipline' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'key choice about' is the wordplay.
'about' indicates an anagram.
'key'+'choice'='keychoice'
'keychoice' is an anagram of 'ICE-HOCKEY'.

Can you help me to learn more?

(Other definitions for ice hockey that I've seen before include "Game played by skaters with a puck" , "Sport with puck" , "Violent sport, big in North America" , "Team game played with long sticks" .)

I've seen this clue in The Mirror.

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