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Heartlessly let two into game, then told them they're too old (3,5)

Ross

I believe the answer is:

age limit

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'old' is the definition.
Both the definition and answer are singular nouns.
Maybe you can see a link between them that I don't see?

I can't explain the rest of the clue.

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(Other definitions for age limit that I've seen before include "terminus a quo, say" , "I am legit (anag)" , "Regulation based on year of birth that sets down when one can no longer do something" , "Bar to those too old or too young" , "Maturity restriction" .)

I've seen this clue in The Irish Times.
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