Invitation to find support in film and song (4,2,2)
I believe the answer is:
lean on me
'invitation to find support' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.
'film and song' is the wordplay.
I cannot really see how this works, but
'film' could be 'm' (1931 Fritz Lang film) and 'm' is found in the answer.
'and' could be 'n' (common abbreviation for 'and') and 'n' is found within the answer.
This explanation may well be incorrect...
'in' acts as a link.
Can you help me to learn more?
(Other definitions for lean on me that I've seen before include "Film" , "70s song" .)