Pair left in two-door car? (6)
I believe the answer is:
couple
'pair' is the definition.
(I know that pair can be written as couple)
'left in two-door car?' is the wordplay.
'left' becomes 'l' (common abbreviation).
'in' is an insertion indicator.
'two-door car?' becomes 'coupe' (I've seen this in another clue).
'l' put inside 'coupe' is 'COUPLE'.
(Other definitions for couple that I've seen before include "Twosome" , "Pair - put together" , "Pair, duo" , "Link together - say two married people" , "Duo, brace" .)