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Rashest at any rate (9)

Ross

I believe the answer is:

leastwise

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'at any rate' is the definition.
(synonyms)

I cannot understand how the remainder of the clue works.

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(Other definitions for leastwise that I've seen before include "infrequently occurring" , "If nothing else" , "anyway" , "However (US)" , "in Hollywood at any rate" .)

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