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Figure wrong, collector's item

Ross

I believe the answer is:

one-off

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'collector's item' is the definition.
Both the definition and answer are singular nouns.
Perhaps they are linked in a way I don't understand?

'figure wrong' is the wordplay.
'figure' becomes 'one' (I've seen this before**).
'wrong' becomes 'off' (I've seen this in other clues).
'one'+'off'='ONE-OFF'

Can you help me to learn more?

(Other definitions for one-off that I've seen before include "Not repeated or reproduced, a single thing" , "Item made once only" , "Unique thing" , "Something unique" , "Unique person or occurrence" .)

I've seen this clue in The Telegraph.
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