Medic, one taking Tube — but not to such an establishment? (5-2)
I believe the answer is:
'not to such an establishment?' is the definition.
I can't judge whether this defines the answer.
'medic one taking tube' is the wordplay.
'medic' becomes 'dr' (abbreviation for doctor).
'one' becomes 'i' (Roman numeral).
'taking' is a charade indicator (letters next to each other).
'tube' becomes 'vein' (vein is a kind of tube).
'but' acts as a link.
Can you help me to learn more?
(Other definitions for drive-in that I've seen before include "Place where patrons may stay in their cars" , "Intended to be visited by car" , "(Of cinema) enterable by car" , "Usable without leaving the car" , "Diviner (anag.)" .)