Crossword Genius

Particular calipers twisted without right (7)

Ross

I believe the answer is:

special

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'particular' is the definition.
(synonyms)

I don't understand how the rest of the clue works.

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(Other definitions for special that I've seen before include "Day's non-menu dish" , "Particular, distinctive" , "Distinguished" , "Particular, peculiar" , "An addition to the standard menu" .)

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