Obtain parking place outside theatre finally (6)
I believe the answer is:
derive
'obtain' is the definition.
(I know that derive is a more specific form of the action obtain)
'parking place outside theatre finally' is the wordplay.
'parking place' becomes 'drive' (as in a driveway).
'outside' means one lot of letters goes inside another.
'finally' indicates one should take the final letters.
The final letter of 'theatre' is 'e'.
'drive' placed around 'e' is 'DERIVE'.
(Other definitions for derive that I've seen before include "Arise (from); deduce" , "Get or trace from a source" , "Infer; originate (from)" , "Issue" , "Originate, come (from)" .)