Gnasher (quod in ore tuo est, non canis Dionysii Minacis) (4)

I believe the answer is:

dens

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

I've seen this clue in The Times.

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