Finished the table without a prescription (4,3,7)
I believe the answer is:
over the counter
'without a prescription' is the definition.
I can't judge whether this defines the answer.
'finished the table' is the wordplay.
'finished' becomes 'over' (over can mean finished or ended).
'table' becomes 'counter' (counter is a kind of table).
'over'+'the'+'counter'='OVER-THE-COUNTER'
Can you help me to learn more?
(Other definitions for over the counter that I've seen before include "unrestricted sale" , "way some drugs are sold" , "By ordinary retail purchase" , "Purchasable without prescription" , "sold quite legally" .)