Crossword Genius

No one's fool, but upset by love (7)

Ross

I believe the answer is:

passion

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'love' is the definition.
(synonyms)

'no one's fool but upset' is the wordplay.
'one's' becomes 'I's' (Roman numeral).
'fool but' becomes 'sap' (synonyms. I am not sure about the 'but' bit.).
'upset' says the letters should be written in reverse.
'no'+'is'+'sap'='noissap'
'noissap' reversed gives 'PASSION'.

'by' acts as a link.

Can you help me to learn more?

(Other definitions for passion that I've seen before include "Intense emotion, anger or love" , "thing one really cares about" , "Strong feeling of intense emotion" , "Rage" , "Fervent love" .)

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