Assume a definite form (4,5)

I believe the answer is:

take shape

'assume a definite form' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for take shape that I've seen before include "Materialise, assume substance" , "Assume a definite form" , "Develop" .)

I've seen this clue in The Mirror and The Times.

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