Lamb or ham (4)
I believe the answer is:
meat
'lamb or ham' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for meat that I've seen before include "Eg, beef or pork" , "Edible flesh" , "grub, say" , "Ham, pork, chicken etc" , "Animal flesh as food" .)