Crossword Genius

Having had too much of a fatheaded misguided dupe (3,2)

Ross

I believe the answer is:

fed up

I'm a little stuck... Click here to teach me more about this clue!

'having had too much' is the definition.
I can't tell whether this defines the answer.

'fatheaded misguided dupe' is the wordplay.
'fatheaded' becomes 'f' (this might be a standard abbreviation of which I'm unaware).
'misguided' is an anagram indicator (letters guided into the wrong places).
'dupe' with letters rearranged gives 'edup'.
'f'+'edup'='FED UP'

'of a' is the link.

Can you help me to learn more?

(Other definitions for fed up that I've seen before include "Annoyed, bored" , "Bored - disgusted" , "Informally bored or discontented (3,2)" , "Surfeited" , "Fattened - annoyed" .)

I've seen this clue in the Evening Standard.
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