Small diagram in collection (5)

I believe the answer is:

inset

'small diagram' is the definition.

'in collection' is the wordplay.
'collection' becomes 'set' (set is a kind of collection).
'in'+'set'='INSET'

(Other definitions for inset that I've seen before include "Thing inserted" , "Part of picture" , "Intimidated" , "Small picture inserted within a larger one" , "Piece let into a garment" .)

I've seen this clue in The Sun.

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