Lower leg part (4)
I believe the answer is:
shin
'lower leg part' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for shin that I've seen before include "Front part of the leg between knee and ankle" , "letter from Israel" , "Part of the human leg" , "Front end of the tibia" , "Bone at front of lower leg" .)