Crossword Genius

Starts off solving crossword on the Mac (4)

Ross

I believe the answer is:

scot

'mac' is the definition.

'starts off solving crossword on the' is the wordplay.
'starts off' says to take the initial letters.
The first letters of 'solving crossword on the' is 'SCOT'.

(Other definitions for scot that I've seen before include "Ancient tax" , "Rabbie Burns, for instance" , "Tax, Glasgow native" , "Payment" , "Aberdonian perhaps" .)

I've seen this clue in The Telegraph.
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