Incidentally, plain-clothes officers (3)
I believe the answer is:
cid
'incidentally plain-clothes officers' is the definition.
I can't tell whether this definition defines the answer.
'incidentally plain-clothes' is the wordplay.
'clothes' says the answer is hidden in the clue (the letters clothe the hidden word).
'CID' is hidden within 'incidentally plain'.
Can you help me to learn more?
I've seen this clue in the Evening Standard.
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