Crossword Genius

Necessitate being collected? (4,3)

Ross

I believe the answer is:

call for

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'necessitate' is the definition.
(calling for is a kind of necessitating)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for call for that I've seen is " Request".)

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