Party goer regularly finding the way out? (4)
I believe the answer is:
door
'the way out?' is the definition.
(way in or out of a building)
'party goer regularly' is the wordplay.
'party' becomes 'do' (do is a kind of party).
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
The alternate letters of 'goer' are 'or'.
'do'+'or'='DOOR'
'finding' acts as a link.
(Other definitions for door that I've seen before include "Swinging barrier" , "Opener" , "Jim Morrison?" , "Entry point" , "place of entry" .)