Crossword Genius

Car found in uncertain place, when battery lead dropped (4)

Ross

I believe the answer is:

limo

'car' is the definition.
(limo is a kind of car)

I cannot understand how the remainder of the clue works.

(Other definitions for limo that I've seen before include "Luxurious car (colloq.)" , "vehicle" , "Luxury car" , "Set of rooms" , "Stretched car (abbr)" .)

I've seen this clue in The Guardian.
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