Romantic writer inspired by lake at sunset (5)
I believe the answer is:
keats
'romantic writer' is the definition.
(John Keats was a Romantic poet)
'inspired by lake at sunset' is the wordplay.
'inspired by' indicates the answer is hidden within the clue.
'KEATS' can be found hidden inside 'lake at sunset'.
(Other definitions for keats that I've seen before include "English romantic poet, d. 1821" , "Endymion, Lamia poet" , "English poet, d. 1821 in Rome of TB" , "To a Nightingale poet" , "Ode to Autumn poet" .)