Maybe a film can't be finished if you go bust (4)
I believe the answer is:
fail
'go bust' is the definition.
(I've seen this in another clue)
'maybe a film can't be finished if' is the wordplay.
I cannot quite understand how this works, but
'a' is found in the answer.
The remaining letters 'fil' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'you' is the link.
Can you help me to learn more?
(Other definitions for fail that I've seen before include "Let down" , "Neglect (to do something)" , "Be unsuccessful, say in exam" , "Come to naught" , "Stop working properly" .)