Crossword Genius

Serious plot in churchyard (5)

Ross

I believe the answer is:

grave

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

'serious' is the definition.
(both can mean solemn)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for grave that I've seen before include "Grim-faced" , "Sober" , "Burial site" , "Weighty" , "Hazardous" .)

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