A film screened by Bluebird's generating goodwill (5)
I believe the answer is:
amity
'goodwill' is the definition.
(I've seen this in another clue)
'a film screened by bluebird's' is the wordplay.
'film' becomes 'M' (i9yi Fritz Lang film).
'screened by bluebird' becomes 'ity' (I can't explain this - if you can you should believe this answer much more).
'a'+'m'+'ity'='AMITY'
'generating' is the link.
Can you help me to learn more?
(Other definitions for amity that I've seen before include "Friendly relations" , "Friendship - goodwill" , "Cordial friendship" , "understanding" , "warmth" .)