Crossword Genius

Film a sheep running under tree on old homestead (6,2,3,4)

Ross

I believe the answer is:

planet of the apes

I'm a little stuck... Click here to teach me more about this clue!

'film a sheep running under' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'tree on old homestead' is the wordplay.
I cannot quite understand how this works, but
'tree' could be 'plane' (plane is a type of tree) and 'plane' is found in the answer.
'on' could be 'to' and 'to' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for planet of the apes that I've seen is " 1968 film remade in 2001".)

I've seen this clue in The Times.
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