Draw arm or leg, as told (4)

I believe the answer is:

limn

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'draw' is the definition.
(limning is a kind of drawing)

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

(Other definitions for limn that I've seen before include "Depict or describe" , "Sketch from slim naiad" , "Paint or Illuminate" , "Represent in painting" , "Paint or draw, or portray in words" .)

I've seen this clue in The Times.

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