Peter Andre's not a false claimant (9)
I believe the answer is:
pretender
'claimant' is the definition.
(thesaurus)
'peter andre's not a false' is the wordplay.
'not' indicates named letters should be taken away.
'false' indicates anagramming the letters.
'peter'+'andre'='peterandre'
'peterandre' with 'a' taken away is 'peterndre'.
'peterndre' is an anagram of 'PRETENDER'.
(Other definitions for pretender that I've seen before include "One acting" , "Claimant, like Bonnie Prince Charlie" , "One claiming a title" , "One who claims a title or position" , "Claimant to a throne, usually without just title" .)