Support party, returning after journey (6)
I believe the answer is:
tripod
'support' is the definition.
(tripod is a kind of support)
'party returning after journey' is the wordplay.
'party' becomes 'do' (do is a kind of party).
'returning' is a reversal indicator.
'after' says to put letters next to each other.
'journey' becomes 'trip' (trip is a kind of journey).
'do' back-to-front is 'od'.
'od' after 'trip' is 'TRIPOD'.
(Other definitions for tripod that I've seen before include "Support needed" , "Three-legged support" , "Pay heed" , "Three-legged stand as for camera" , "Torpid (anag.)" .)