Secluded valleys (5)

I think it could be either:

glens

dells

'secluded valleys' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for glens that I've seen before include "Narrow mountain valleys" , "Northern valleys" .)

I've seen this clue in the Universal, The Mirror and The Wall Street Journal.

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