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 am not sure about this - if you are sure you should believe this answer much more).
'a'+'m'+'ity'='AMITY'
'generating' acts as a 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" .)