Crossword Genius

Understanding how to divide thirty into three equal parts, essentially (7)

Ross

I believe the answer is:

entente

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'understanding' is the definition.
(entente is a kind of understanding)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for entente that I've seen before include "friendly relations" , "Harmony" , "Political agreement" , "A friendly understanding between countries, may be cordial" , "International agreement" .)

I've seen this clue in The Hindu.
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