Den denizen (4)
I believe the answer is:
bear
'den denizen' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for bear that I've seen before include "Carry; large mammal" , "Situation where there are more sellers than willing buyers" , "Hack" , "Tolerate; animal" , "Relating to charged particles" .)