Crossword Genius

Start to write on the disc (4)

Ross

I believe the answer is:

open

'start' is the definition.
(opening is a kind of starting)

'write on the disc' is the wordplay.
'write' becomes 'pen' ('pen' can be a synonym of 'write').
'on' means one lot of letters go next to another.
'the disc' becomes 'o'.
'pen' after 'o' is 'OPEN'.

'to' acts as a link.

(Other definitions for open that I've seen before include "Release" , "Frank; unobstructed" , "Honest - frank" , "Public" , "unsealed" .)

I've seen this clue in the Evening Standard.
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