Good reason to get your skates on? (4)

I believe the answer is:

rink

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'good' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for rink that I've seen before include "Ice-skating venue" , "Ice hockey floor" , "Skating venue" , "Place to skate" , "frozen surface" .)

I've seen this clue in the Evening Standard.

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