Crossword Genius

Just the night for play (7)

Ross

I believe the answer is:

twelfth

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'just' is the definition.
Both the answer and definition are adjectives. Perhaps you can see a link between them that I can't see?

I don't understand how the rest of the clue works.

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(Other definitions for twelfth that I've seen before include "for the night? Sort of" , "Ordinal number" , "day of parades" , "- - man (cricket)" , "Sewn join" .)

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