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One who longs to eat crab's head or claw (6)

Ross

I believe the answer is:

pincer

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'claw' is the definition.
(synonyms)

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

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(Other definitions for pincer that I've seen before include "Surrounding (movement)" , "Claw, nipper" , "This movement is a converging attack" , "Lobster's claw" , "Front claw" .)

I've seen this clue in The Independent.
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