Minor celeb's sore? (7)
I believe the answer is:
blister
I believe this clue is a double definition.
'minor celeb's' is the first definition.
(a B-lister is a celeb less famous than an A-lister)
'sore?' is the second definition.
(thesaurus)
(Other definitions for blister that I've seen before include "Bubble raised on the skin" , "lump on skin" , "Bubble on the skin filled with fluid" , "Bubble-like swelling on skin" , "Result of friction" .)