White bear on the run (6)
I believe the answer is:
wanted
'white bear on the run' is the definition.
Both the definition and answer are adjectives. Maybe you can see an association between them that I don't see?
'white bear on the run' is the wordplay.
'white' becomes 'w'.
'bear on the run' becomes 'anted' (I can't explain this - if you can you should give a lot more credence to this answer).
'w'+'anted'='WANTED'
Can you help me to learn more?
(Other definitions for wanted that I've seen before include "Lacked; type of police poster" , "Desired or wished for" , "Wished-for" , "Required, needed" , "sought by police?" .)