Drunk comes round not quite roaring early in the evening (8)
I believe the answer is:
twilight
'early in the evening' is the definition.
(twilight happens early in the evening)
'drunk comes round not quite roaring' is the wordplay.
'drunk' becomes 'tight' (slang term).
'comes round' indicates putting letters inside.
'not quite' means to remove the last letter.
'roaring' becomes 'wild' (like a wild animal).
'wild' with its last letter taken off is 'wil'.
'tight' enclosing 'wil' is 'TWILIGHT'.
(Other definitions for twilight that I've seen before include "Time of day following sunset" , "when the night's still young?" , "semi-darkness" , "Period post-sunset" , "Gloaming" .)