A leg, perhaps, of less than sublime form (4)

I believe the answer is:

limb

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'a leg perhaps' is the definition.
(leg is a kind of limb)

I don't understand the remainder of the clue.

(Other definitions for limb that I've seen before include "Substantial branch from a tree trunk" , "Eg wing" , "A supporter" , "Large tree branch" , "arm, perhaps" .)

I've seen this clue in the Evening Standard.

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