Opposing rise, organised police operation (9)
I believe the answer is:
resisting
'opposing' is the definition.
(resisting is a kind of opposing)
'rise organised police operation' is the wordplay.
'organised' indicates anagramming the letters.
'police operation' becomes 'sting' (sting can mean a police operation).
'rise' with letters rearranged gives 'resi'.
'resi'+'sting'='RESISTING'
(Other definitions for resisting that I've seen before include "Withstanding" , "Refraining from" , "smart, that!" .)