Clue: Pint he's loth to swallow, here ideally for a drive? (2,3,4)
Answer: IN THE SLOT
Explanation: Pint he's loth to swallow, here ideally for a drive? (2,3,4)
Hidden in [to swallow] "p**INT HE'S LOT**h" 
*I think the definition part may be referring to a portable drive going into a slot in a computer, but open to other suggestions.