Pound shop tried some out (9)

I believe the answer is:

dimestore

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'pound shop' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'tried some out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'tried'+'some'='triedsome'
'triedsome' anagrammed gives 'DIMESTORE'.

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I've seen this clue in The Daily Express.

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