Crossword Genius

Is written in a document in error (5)

Ross

I believe the answer is:

amiss

'in error' is the definition.
(I've seen this in another clue)

'is written in a document' is the wordplay.
'written in' means one lot of letters goes inside another.
'document' becomes 'ms'.
'a'+'ms'='ams'
'is' put within 'ams' is 'AMISS'.

(Other definitions for amiss that I've seen before include "Faulty" , "Mistakenly" , "Wrongly" , "Wrorg" , "error" .)

I've seen this clue in The Times.
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