Bears' lairs (4)

I believe the answer is:

dens

'bears' lairs' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for dens that I've seen before include "Man's" , "Lairs" , "Habitats of some wild animals" , "Studies" , "Habitations of wild animals" .)

I've seen this clue in the Universal, the King Feature Syndicate, the USA Today, The Wall Street Journal, The Star Tribune and the Newsday.

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