Crossword Genius

Daughter kept so untidy a work surface (7)

Ross

I believe the answer is:

desktop

'a work surface' is the definition.
(the top of one's desk)

'daughter kept so untidy' is the wordplay.
'daughter' becomes 'd' (genealogical abbreviation).
'untidy' is an anagram indicator.
'kept'+'so'='keptso'
'keptso' anagrammed gives 'esktop'.
'd'+'esktop'='DESKTOP'

(Other definitions for desktop that I've seen before include "working area in office" , "Sort of publishing" , "Publishers'" , "Like a computer system" , "often supports a mass of papers?" .)

I've seen this clue in The Times.
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