Small wood varies in scope (5)

I believe the answer is:

copse

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'small wood' is the definition.
(small woodland area)

'varies in scope' is the wordplay.
'scope' anagrams to 'COPSE'.
But, I am not clear how this is indicated.

Can you help me to learn more?

(Other definitions for copse that I've seen before include "Stand of trees" , "Cultivated woodland area" , "Dense thicket of trees" , "Harvested woodland" , "Piece of woodland used for cutting" .)

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

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