Drunk full of endless hogwash in final years (8)
I believe the answer is:
twilight
'final years' is the definition.
The definition and answer can be both related to time as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'drunk full of endless hogwash in' is the wordplay.
'drunk full' becomes 'tight' (slang term. I am not sure about the 'full' bit.).
'of endless' means to look at the middle letters (I've seen 'endless' mean this).
'hogwash' becomes 'swill' (I've seen this in another clue).
'in' indicates putting letters inside.
The middle letters of 'swill' are 'wil'.
'tight' going around 'wil' is 'TWILIGHT'.
Can you help me to learn more?
(Other definitions for twilight that I've seen before include "semi-darkness" , "nightfall" , "The time between day and night" , "Gloaming" , "Period just after sunset, becoming dark" .)