Dens (5)

I believe the answer is:

lairs

'dens' is the definition.
('lair' can be a synonym of 'den')

This is all the clue.

(Other definitions for lairs that I've seen before include "Habitations of wild animals" , "retreats" , "Places to hide" , "Resting places of wild animals" , "Animals' dens" .)

I've seen this clue in The New York Times, the Evening Standard, the Sydney Morning Herald, the USA Today, The Mirror, the LA Times, The Wall Street Journal and The Star Tribune.

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