Scotch added on drinks dad and I had (3,4,2)
I believe the answer is:
put paid to
'scotch' is the definition.
I know nothing about this answer so I cannot judge whether this works.
'added on drinks dad and i had' is the wordplay.
'added on' becomes 'putto' (I can't justify this - if you can you should give a lot more credence to this answer).
'drinks' indicates putting letters inside (inserted letters are consumed or drunk).
'dad' becomes 'pa' (both can mean one's father).
'and' means one lot of letters go next to another.
'i had' becomes 'i'd' (contraction).
'pa'+'id'='paid'
'putto' enclosing 'paid' is 'PUT PAID TO'.
Can you help me to learn more?
(Other definitions for put paid to that I've seen before include "ended" , "Deal finally with" , "End - destroy" , "Confirm bills settled" , "Destroy hopes or chances - send receipt?" .)