Crossword Genius

Carousal long overdue (4,4)

Ross

I believe the answer is:

high time

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This might be a double definition.

'carousal' is the first definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'long overdue' is the second definition.
(I've seen this before)

Can you help me to learn more?

(Other definitions for high time that I've seen before include "Beyond the proper hour, but not too late - check lofty clock" , "'The latest possible moment (4,4)'" , "long overdue" .)

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