Crossword Genius

Small computer over a fast one (4)

Ross

I believe the answer is:

scam

'a fast one' is the definition.
(I've seen this in another clue)

'small computer over' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'computer' becomes 'Mac' (Apple Mac computer).
'over' says the letters should be written backwards.
'mac' reversed gives 'cam'.
's'+'cam'='SCAM'

(Other definitions for scam that I've seen before include "A slangy swindle or fraud" , "fiddle" , "Con trick" , "Swindle, fraud (colloq.)" , "Dodgy business" .)

I've seen this clue in The Independent.
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