Crossword Genius

Fed up with a new editor, the fathead! (5,2)

Ross

I believe the answer is:

tired of

'fed up' is the definition.
(synonyms)

'with a new editor the fathead' is the wordplay.
'with' is a charade indicator (letters next to each other).
'a new' indicates anagramming the letters.
'the fathead' becomes 'f' (head letter of 'fat').
'editor' with letters rearranged gives 'tiredo'.
'tiredo' put next to 'f' is 'TIRED OF'.

(Another definition for tired of that I've seen is " Bored with".)

I've seen this clue in the Evening Standard.
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