Obscure celeb luring crowds (4)
I believe the answer is:
blur
'obscure' is the definition.
(both can mean to vague or indistinct)
'celeb luring crowds' is the wordplay.
'crowds' says the answer is hidden in the clue (the clue crowds or surrounds the answer).
'BLUR' can be found hidden inside 'celeb luring'.
(Other definitions for blur that I've seen before include "British rock group" , "Smear, make indistinct" , "Hazy patch" , "Group - thing not clearly seen" , "Obscure; smudge" .)