It's a little higher than the ankle - or a little lower! (4)

I believe the answer is:

calf

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'little lower' is the definition.
(little cow - 'low' can mean to make a mooing sound)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for calf that I've seen before include "binding?" , "Roo's mum (A. A. Milne)" , "A little lower" , "Young bovine animal" , "Back of lower leg" .)

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