Work like 'The Raven'? Put in 'Always' and 'Nevermore', say (9)
I believe the answer is:
opposites
'always and nevermore say' is the definition.
('always' and 'nevermore' are opposites)
'work like the raven'? put in' is the wordplay.
'work' becomes 'op' (abbreviation for opus).
'like the raven'?' becomes 'Poes' (The Raven is a poem by Edgar Allan Poe).
'put' becomes 'sit' (sitting is a kind of putting).
'in' indicates putting letters inside.
'poes' going around 'sit' is 'posites'.
'op'+'posites'='OPPOSITES'
(Other definitions for opposites that I've seen before include "What proverbially attract" , "Inverses" , "said to be attractive" , "such as the Poles?" , "Heads and tails, for example" .)