Small meal from lamb item (4)
I believe the answer is:
bite
'small meal' is the definition.
(I've seen this in another clue)
'from lamb item' is the wordplay.
'from' says the answer is hidden in the clue.
'BITE' is hidden within 'lamb item'.
(Other definitions for bite that I've seen before include "Get teeth into" , "Nip; nibble" , "Injury from teeth" , "Grip; take effect" , "Quick snack" .)