Squirrel's nest (4)

I believe the answer is:
drey
'squirrel's nest' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for drey that I've seen before include "A squirrel's tree nest" , "Nest of a squirrel" .)
I've seen this clue in The Irish Times, The Times, The Telegraph, The Guardian, The Mirror, The Independent and the Evening Standard.
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