The Boys in Blue, or Blur? (4)
I believe the answer is:
fuzz
'blur?' is the definition.
(thesaurus)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for fuzz that I've seen before include "Frizzy hair; blurred image" , "Indistinctness" , "Covering of fine hair - police" , "Hairy layer" , "Soft, fine hair; blur" .)