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

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