Obscure Britpop band (4)
I believe the answer is:
blur
This clue is a double definition.
'obscure' is the first definition.
(both can mean to vague or indistinct)
'britpop band' is the second definition.
(band in Britpop genre)
(Other definitions for blur that I've seen before include "Group - smudge" , "Indistinct mark" , "This Brit-pop band is a bit hazy" , "murky spot" , "fade" .)