"Ode to a Nightingale” poet John (5)
I believe the answer is:
keats
'ode to a nightingale poet john' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for keats that I've seen before include "John - - (19)" , "John -, Endymion poet" , "English romantic poet, d. 1821" , "Grecian Urn poet" , "Author of the poem Ode to a Nightingale, d. 1821" .)