Poet found in lake at sunset (5)
I believe the answer is:
keats
'poet' is the definition.
(John Keats)
'in lake at sunset' is the wordplay.
'in' indicates a hidden word.
'KEATS' is hidden within 'lake at sunset'.
'found' is the link.
(Other definitions for keats that I've seen before include "Endymion, Lamia poet" , "Author of Endymion and Ode to a Nightingale" , "Author of the poem Ode to a Nightingale, d. 1821" , "Ode to Autumn poet" , "To a Nightingale poet" .)