For silly short film turned to Sky (3)

'sky' is the definition.
Both the definition and answer are singular nouns.
Maybe you can see an association between them that I don't see?

'for silly short film turned' is the wordplay.
'for silly' becomes 'd' (I am not sure about this - if you are sure you should believe this answer much more).
'short' means to remove the last letter.
'film' becomes 'vid' (short for video).
'turned' is a reversal indicator.
'vid' with its last letter removed is 'vi'.
'vi' in reverse letter order is 'iv'.
'd'+'iv'='DIV'

'to' is the link.

Can you help me to learn more?