War film that's hardly The Caine Mutiny (4)

I believe the answer is:

zulu

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

'war film' is the definition.
'zulu' can be an answer for 'film' (I have seen 'famous film' mean 'zulu' so perhaps 'film' could also mean 'zulu'). I am not sure about the 'war' bit.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for zulu that I've seen before include "Bantu language of south-eastern Africa" , "Language of southeast Africa" , "Bantu people" , "SE African people, Shaka their founder" , "Code word for Z" .)

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