Police force, green, admire criminal (11)
I believe the answer is:
gendarmerie
'police force' is the definition.
(gendarmerie is a kind of police force)
'green admire criminal' is the wordplay.
'criminal' is an anagram indicator.
'green'+'admire'='greenadmire'
'greenadmire' with letters rearranged gives 'GENDARMERIE'.
(Other definitions for gendarmerie that I've seen before include "foreign force" , "French policing force" , "French paramilitary police" , "Police force" , "Nick" .)