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 Guardian, The Telegraph, The Mirror, The Wall Street Journal, the Evening Standard, the LA Times, The Independent, the King Feature Syndicate, the Penny Press and The Irish Independent.

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