Shortly getting in a large car (6)
I believe the answer is:
saloon
'car' is the definition.
(I've seen this before)
'shortly getting in a large' is the wordplay.
'shortly' becomes 'soon' ('soon' can be a synonym of 'shortly'**).
'getting in' means one lot of letters goes inside another.
'large' becomes 'l'.
'a'+'l'='al'
'soon' placed around 'al' is 'SALOON'.
(Other definitions for saloon that I've seen before include "Pub room" , "Lounge bar" , "Bar room" , "An American pub, as in the wild west" , "Car; public room" .)