Crossword Genius

Watch door in study being smashed (6,4)

Ross

I believe the answer is:

sentry duty

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'watch' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe you can see an association between them that I don't see?

'door in study being smashed' is the wordplay.
'door' becomes 'entry' (synonyms).
'in' indicates putting letters inside.
'being smashed' is an anagram indicator.
'study' is an anagram of 'sduty'.
'entry' inserted into 'sduty' is 'SENTRY DUTY'.

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I've seen this clue in The Times.
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