Crossword Genius

Not having used sheets until pens deployed (7-2)

Ross

I believe the answer is:

unslept-in

'not having used sheets' is the definition.
(as in bedsheets which haven't been slept in)

'until pens deployed' is the wordplay.
'deployed' indicates an anagram.
'until'+'pens'='untilpens'
'untilpens' anagrammed gives 'UNSLEPT-IN'.

I've seen this clue in The Times.
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