Crossword Genius

Success by Mark, an assassin (6)

Ross

I believe the answer is:

hitman

'assassin' is the definition.
(I've seen this before)

'success by mark an' is the wordplay.
'success' becomes 'hit' (a hit is a commercial success).
'by' means one lot of letters go next to another.
'mark' becomes 'm'.
'hit'+'m'+'an'='HITMAN'

(Other definitions for hitman that I've seen before include "killer" , "Assassin" , "offer?" , "Hired gun" .)

I've seen this clue in The Sun.
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