This bear is white (5)
I believe the answer is:
polar
'this bear is white' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for polar that I've seen before include "-- Bear; -- circle" , "Extremely cold region" , "Relating to Earth's coldest regions" , "Regions at the top and bottom of the world" , "- bear; - cap" .)