Crossword Genius

Article one’s involved in writing up (5)

Ross

I believe the answer is:

amiss

'up' is the definition.
(thesaurus)

'article one's involved in writing' is the wordplay.
'article' becomes 'a' (indefinite article).
'one's' becomes 'is' (roman numeral**).
'involved in' means one lot of letters goes inside another.
'writing' becomes 'ms' (abbreviation for manuscript).
'is' inserted inside 'ms' is 'miss'.
'a'+'miss'='AMISS'

(Other definitions for amiss that I've seen before include "Haywire" , "Unsuitable" , "Mistakenly" , "Wrongly" , "Not functioning properly" .)

I've seen this clue in The Times.
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