Crossword Genius

Plans advanced in certain days in Rome (5)

Ross

I believe the answer is:

ideas

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'plans' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for ideas that I've seen before include "Thoughts, personal views" , "thinking" , "Brainwaves" , "Brain waves" , "Thoughts from Sadie" .)

I've seen this clue in The Telegraph.
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