Crossword Genius

Shells found in farmer's furrows? (10)

Ross

I believe the answer is:

cartridges

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

This could be a double definition.

'shells' is the first definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Maybe there's a link between them I don't understand?

'farmer's furrows?' is the second definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Maybe they are linked in a way I don't understand?

'found in' acts as a link.

Can you help me to learn more?

(Another definition for cartridges that I've seen is " containers".)

I've seen this clue in The Telegraph.
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