Crossword Genius

Footloose prisoner unstable, they reckon (7)

Ross

I believe the answer is:

opiners

'they reckon' is the definition.
(I've seen this in another clue)

'footloose prisoner unstable' is the wordplay.
'footloose' means to remove the last letter (the bottom letter or 'foot' is loosened).
'unstable' indicates anagramming the letters.
'prisoner' with its final letter taken away is 'prisone'.
'prisone' anagrammed gives 'OPINERS'.

I've seen this clue in the Sydney Morning Herald.
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