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Having no answer, somehow shell peas unaided (8)

Ross

I believe the answer is:

helpless

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'unaided' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

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(Other definitions for helpless that I've seen before include "Powerless, defenceless" , "Unable to manage independently" , "Unaided" , "Uncontrollable (with laughter)" , "has no defence" .)

I've seen this clue in The Times and The Daily Express.
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