2 down
Rather
drunk,
though
maintaining
motorway’s
maximum
speed,
perhaps
(5)
Rather drunk, though maintaining motorway’s maximum speed, perhaps (5)
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The definition is at the end of the clue.
How the clue works
Look at maximum speed, perhaps — that's your definition, since a speed limit is one kind of limit. Rather gets anagrammed (that's your "drunk") to give LITR, and then M (motorway) is slotted inside it ("maintaining"), leaving you with LI-M-IT.