Crossword Genius

Fool repeatedly at home for killer (8)

Ross

I believe the answer is:

assassin

'for killer' is the definition.
(assassin is a kind of killer)

'fool repeatedly at home' is the wordplay.
'fool' becomes 'ass' (both can mean a stupid person).
'repeatedly' says to double the letters.
'at home' becomes 'in' ('I'm in' can mean 'I'm at home').
'ass' duplicated is 'assass'.
'assass'+'in'='ASSASSIN'

(Other definitions for assassin that I've seen before include "Bravo!" , "Murderer (of prominent figure)" , "Killer of famous person" , "butcher" , "Hired murderer" .)

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