Crossword Genius

Inaccuracies, I bet, in the writing (8)

Ross

I believe the answer is:

mistakes

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'inaccuracies' is the definition.
Although both the answer and definition are plural nouns, I cannot understand how one could define the other.

'i bet in the writing' is the wordplay.
'bet' becomes 'stake' (synonyms).
'in the' is an insertion indicator.
'writing' becomes 'ms' (abbreviation for manuscript).
'i'+'stake'='istake'
'istake' going inside 'ms' is 'MISTAKES'.

Can you help me to learn more?

(Other definitions for mistakes that I've seen before include "Errors" , "Blunders, slips" , "Misguided or wrong acts" .)

I've seen this clue in the Evening Standard.
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