Crossword Genius

Person writing second message shortened by 60% (4)

Ross

I believe the answer is:

memo

'message shortened by 60' is the definition.
(short for memorandum - 60% of the term is removed)

'person writing second' is the wordplay.
'person writing' becomes 'me' (the person writing the clues).
'second' becomes 'mo' (both are short periods of time).
'me'+'mo'='MEMO'

(Other definitions for memo that I've seen before include "Reminder (abbr)" , "It will remind" , "- Currie, Br. politician" , "Brief note, usually between co-workers" , "Note written as a reminder" .)

I've seen this clue in The Guardian.
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