Crossword Genius

March is over so they can get taken in immediately (5,5)

Ross

I believe the answer is:

april fools

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'march' is the definition.
The answer and definition can be both related to time as well as being singular nouns.
Perhaps there's a link between them I don't understand?

I can't explain the remainder of the clue.

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I've seen this clue in The Irish Times.
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