Ms lang eating starter of Iberian goat (3)
I believe the answer is:
kid
'goat' is the definition.
(I know that kid is a type of goat)
'ms lang eating starter of iberian' is the wordplay.
'ms lang' becomes 'kd' (musician k.d. lang).
'eating' means one lot of letters goes inside another.
'starter of' suggests taking the first letters.
The first letter of 'iberian' is 'i'.
'kd' placed around 'i' is 'KID'.
(Other definitions for kid that I've seen before include "Deceive - child" , "Schoolboy" , "Tease; hoodwink" , "Sort of glove" , "Goat - boy" .)