Blatant over bust I fancy (9)
I believe the answer is:
obtrusive
'blatant' is the definition.
(thesaurus)
'over bust i fancy' is the wordplay.
'fancy' indicates anagramming the letters.
'over'+'bust'+'i'='overbusti'
'overbusti' anagrammed gives 'OBTRUSIVE'.
(Other definitions for obtrusive that I've seen before include "Unpleasantly noticeable or prominent" , "Pushing - forward" , "Noticeably prominent" , "Over-prominent" , "difficult to miss" .)