Crossword Genius

Deduces a guest is wrong, and that's probably right (8,5)

Ross

I believe the answer is:

educated guess

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'probably right' is the definition.
The definition suggests a singular noun which matches the answer.

'deduces a guest is wrong' is the wordplay.
'is wrong' indicates an anagram.
'deduces'+'a'+'guest'='deducesaguest'
'deducesaguest' is an anagram of 'EDUCATED GUESS'.

'and that's' is the link.

Can you help me to learn more?

(Another definition for educated guess that I've seen is " good shot".)

I've seen this clue in The Daily Express.
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