Presumably he'd give dad money (3)
I believe the answer is:
pal
'presumably he'd' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'give dad money' is the wordplay.
'give' says to put letters next to each other.
'dad' becomes 'pa' (both can mean one's father).
'money' becomes 'l' (L can mean 'pounds').
'pa' next to 'l' is 'PAL'.
Can you help me to learn more?
(Other definitions for pal that I've seen before include "Mate, buddy" , "Crony" , "Mate, informal friend" , "Close friend" , "Friend (colloq.)" .)