These can detect shots outside a locked room (10)
I believe the answer is:
photocells
'these can detect' is the definition.
The definition suggests an adverb but the answer is not.
'shots outside a locked room' is the wordplay.
'shots' becomes 'photos' (I've seen this in another clue).
'outside' means one lot of letters goes inside another.
'a locked room' becomes 'cell' (prison cell).
'photos' going around 'cell' is 'PHOTOCELLS'.
Can you help me to learn more?
I've seen this clue in The Independent.
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