One providing dad with money? (3)
I believe the answer is:
pal
'one providing' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'dad with money?' is the wordplay.
'dad' becomes 'pa' (pa can mean someone's father).
'with' means one lot of letters go next to another.
'money?' becomes 'l' (L can mean 'pounds').
'pa'+'l'='PAL'
Can you help me to learn more?
(Other definitions for pal that I've seen before include "Bud" , "Mate, informal friend" , "Close friend" , "Friend (colloq.)" , "Buddy, chum" .)