He's relatively willing to lend you money (5)
I believe the answer is:
uncle
'he's relatively willing to lend' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'money' is the wordplay.
I cannot quite understand how this works, but
'money' could be 'l' (L can mean 'pounds') and 'l' is present in the answer.
The remaining letters 'unce' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'you' acts as a link.
Can you help me to learn more?
(Other definitions for uncle that I've seen before include "Dad's brother" , "one who's taken the pledge" , "For example, Tom Cobbleigh" , "Family relative" , "Law enforcement body" .)