Unimportant person who's all arms and legs? (6)

I believe the answer is:

nobody

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

I can't explain the remainder of the clue.

(Other definitions for nobody that I've seen before include "Lightweight" , "Not a soul" , "Person without authority or standing - hardly exists" , "being without value" , "problem for Morse?" .)

I've seen this clue in the Evening Standard.

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