Crossword Genius

Latin masters'd let fly -- if Cicero's passage were this? (13)

Ross

I believe the answer is:

mistranslated

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'cicero's passage were this?' is the definition.
The definition suggests a singular noun but the answer is not.

'latin masters'd let fly' is the wordplay.
'latin masters'd' can be anagrammed to 'MISTRANSLATED'.
However, I am not clear how the anagram is indicated.

'if' acts as a link.

Can you help me to learn more?

I've seen this clue in The Telegraph.
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