Teen’s idea about prisoners (9)

I believe the answer is:

detainees

'prisoners' is the definition.
(detainee is a kind of prisoner)

'teen's idea about' is the wordplay.
'about' indicates an anagram.
'teens'+'idea'='teensidea'
'teensidea' with letters rearranged gives 'DETAINEES'.

(Another definition for detainees that I've seen is " See Danite among those confined by authorities".)

I've seen this clue in The Mirror.

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