Walked out of the French film's premiere, cross (4)
I believe the answer is:
left
'walked out' is the definition.
(I've seen this in another clue)
'the french film's premiere cross' is the wordplay.
'the french' becomes 'le' ('the' in French).
'film's premiere' becomes 'f' (I can't justify this - if you can you should believe this answer much more).
'cross' becomes 'T' (shape).
'le'+'f'+'t'='LEFT'
'of' is the link.
Can you help me to learn more?
(Other definitions for left that I've seen before include "The side of socialism" , "set out" , "Withdrew - Labour" , "Deserted; port" , "Went; port" .)