Soldier obtained leg-of-mutton (5)
I believe the answer is:
gigot
'mutton' is the definition.
(I've seen this before)
'soldier obtained' is the wordplay.
'soldier' becomes 'GI' (GI can mean a US soldier).
'obtained' becomes 'got' ('get' can be a synonym of 'obtain').
'gi'+'got'='GIGOT'
'leg-of' is the link.
This may not be right. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for gigot that I've seen before include "joint of meat" , "Perceive by touch" , "A bit of mutton" , "Mutton or lamb leg" .)