The solitary Mr Sloan (3)
I believe the answer is:
tod
This clue could be a double definition.
'the solitary mr' is the first definition.
'Tod' can be an answer for 'mr'. I am not sure about the 'the solitary' bit.
'sloan' is the second definition.
Both the answer and definition are singular nouns.
Perhaps you can see an association between them that I don't see?
Can you help me to learn more?
(Other definitions for tod that I've seen before include "One's alone on this" , "Former English weight for wool - dot it" , "If you're on it, you're on your own" , "Fox" , "Sly person" .)