Lair (3)

I think it could be either:

den

pen

'lair' is the definition.
(synonyms)

This is all the clue.

(Other definitions for den that I've seen before include "Animal's home or gent's study" , "Hidden lair of an animal" , "Wild animal's home" , "Animal's lair or man's study" , "Hiding place" .)

I've seen this clue in The Telegraph, The Independent, The Irish Independent, The Mirror, the Evening Standard, the LA Times, The Guardian and the King Feature Syndicate.

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