Lamb? No, but minced steak (5)
I believe the answer is:
keats
'lamb? no' is the definition.
The definition suggests a singular noun which matches the answer.
'minced steak' is the wordplay.
'minced' indicates an anagram.
'steak' with letters rearranged gives 'KEATS'.
'but' is the link.
Can you help me to learn more?
(Other definitions for keats that I've seen before include "Early 19th century poet" , "Grecian Urn poet" , "English poet, 1795-1821" , "To a Nightingale poet" , "English romantic poet, d. 1821" .)