Way to support film events regularly lacking journalists (5,6)
I believe the answer is:
fleet street
'journalists' is the definition.
(Fleet Street can mean the UK newspaper industry)
'way to support film events regularly lacking' is the wordplay.
'way' becomes 'street' (street is a kind of way).
'to support' says to put letters next to each other (in a down clue, some letters hold others up).
'regularly lacking' means one should take alternating letters (letters removed at regular intervals).
'film'+'events'='filmevents'
The alternate letters of 'filmevents' are 'fleet'.
'street' after 'fleet' is 'FLEET STREET'.
(Other definitions for fleet street that I've seen before include "Collective name for British journalism" , "Part of London which became synonymous with journalism" , "Old London newspaper centre" , "British national newspaper journalism" , "Traditional newspaper area of London" .)