Crossword Genius

Shoot serial we hear that's enjoyed by cinema-goers (7)

Ross

I believe the answer is:

popcorn

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'shoot' is the definition.
The answer and definition can be both plants as well as being singular nouns.
Perhaps there's a link between them I don't understand?

I cannot understand how the rest of the clue works.

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(Other definitions for popcorn that I've seen before include "Exploded maize" , "Stuff to eat at the cinema" , "making a meal of it?" , "Heated maize kernel" , "Kernels exploded by heat" .)

I've seen this clue in The Independent.
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