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

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