Crossword Genius

A film or three (4)

Ross

I believe the answer is:

omen

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This clue might be a double definition.

'a film' is the first definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps you can see a link between them that I don't see?

'three' is the second definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'or' acts as a link.

Can you help me to learn more?

(Other definitions for omen that I've seen before include "writing on the wall" , "Straw in the wind" , "Sign of something about to happen" , "Forecast" , "Portent, prophetic sign" .)

I've seen this clue in the Evening Standard.
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