A leggy youngster (4)

I believe the answer is:

calf

I'm a little stuck... Click here to teach me more about this clue!

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

I don't understand the rest of the clue.

(Other definitions for calf that I've seen before include "Young animal - part of leg" , "Part of the leg - baby farm animal" , "Young cow - part of the leg" , "Young animal associated with soft leather" , "Is it above the ankle" .)

I've seen this clue in the Evening Standard.

Want a hint initially instead of a full solution? Install my app