Leg part guarded in soccer (4)
I believe the answer is:
shin
'leg part guarded in soccer' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for shin that I've seen before include "piece of beef" , "Front part of the leg between knee and ankle" , "letter from Israel" , "Cut of beef; part of leg" , "kick" .)