Cook steak for a poet (5)
I believe the answer is:
keats
'for a poet' is the definition.
(John Keats)
'cook steak' is the wordplay.
'cook' indicates an anagram.
'steak' is an anagram of 'KEATS'.
(Other definitions for keats that I've seen before include "Ode to Autumn poet" , "English poet, d. 1821 in Rome of TB" , "Early 19th century poet" , "John --, English poet" , "Grecian Urn poet" .)