Day goes on forever for one in a rut? (4)
I believe the answer is:
deer
'a rut?' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'day goes on forever for one' is the wordplay.
'day' becomes 'd' (abbreviation for day).
'goes on' says to put letters next to each other.
'forever for one' becomes 'eer' (I can't explain this - if you can you should believe this answer much more).
'd'+'eer'='DEER'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for deer that I've seen before include "maybe does" , "Like a power switch" , "The - Hunter, 1978 film" , "does for example" , "Ruminant(s) -- breed of 13 down" .)