Crossword Genius

Phoney heartless Blair messed about (10)

Ross

I believe the answer is:

dissembler

'phoney' is the definition.
('dissembler' can be a synonym of 'phoney')

'heartless blair messed about' is the wordplay.
'heartless' suggests removing the centre.
'about' indicates anagramming the letters.
'blair' with its middle taken out is 'blir'.
'blir'+'messed'='blirmessed'
'blirmessed' is an anagram of 'DISSEMBLER'.

I've seen this clue in The Telegraph.
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