Subject to leave car in place of amusement (5,4)
I believe the answer is:
theme park
'place of amusement' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.
'subject to leave car' is the wordplay.
'subject' becomes 'theme' (theme can mean a topic or subject).
'to leave car' becomes 'park' (I've seen this before).
'theme'+'park'='THEME PARK'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for theme park that I've seen before include "Area with rides, displays, etc" , "recreation area" , "Subject-based leisure attraction" , "number of day-trippers here" , "Eg, Alton Towers" .)