Thick fleshy part of the back of the leg between the ankle and the knee (4)

I believe the answer is:

calf

(Other definitions for calf that I've seen before include "Young animal associated with soft leather" , "Roo's mum (A. A. Milne)" , "Bit of leg" , "stocking filler" , "Young cow or bull" .)

I've seen this clue in The Mirror.

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