Bear in den: rue disturbing? (6)
I believe the answer is:
endure
'bear' is the definition.
(both can mean to tolerate)
'den rue disturbing?' is the wordplay.
'disturbing?' indicates anagramming the letters.
'den'+'rue'='denrue'
'denrue' with letters rearranged gives 'ENDURE'.
'in' is the link.
(Other definitions for endure that I've seen before include "Persist over time" , "Continue to exist" , "Go through" , "Abide" , "Last or undergo" .)