Close imitation of a valley! (4)

I believe the answer is:

glen

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'valley' is the definition.
(I know that glen is a type of valley)

I can't explain the remainder of the clue.

(Other definitions for glen that I've seen before include "Narrow valley with a stream" , "Narrow Scots valley" , "Scottish or Irish valley" , "Long narrow valley in Scotland" , "Depression in Scotland" .)

I've seen this clue in the Evening Standard.

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