Last pole for bears (7)
I believe the answer is:
'for bears' is the definition.
(to bear something is to endure or tolerate it)
'last pole' is the wordplay.
'last' becomes 'endure' (enduring is a kind of lasting).
'pole' becomes 's' (abbreviation for South, as in South Pole).
(Other definitions for endures that I've seen before include "Ensured (anag.)" , "Tolerates" , "Lasts or puts up with" , "Suffers or lasts" , "Remains firm" .)