I'm returning the wager - a slip has occurred (7)

I believe the answer is:

mistake

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'a slip has occurred' is the definition.
I can't tell whether this defines the answer.

'i'm returning the wager' is the wordplay.
'returning' says the letters should be written in reverse.
'the wager' becomes 'stake' (synonyms).
'im' written backwards gives 'mi'.
'mi'+'stake'='MISTAKE'

Can you help me to learn more?

(Other definitions for mistake that I've seen before include "Oversight" , "16 down" , "Fault" , "Error" , "Slip" .)

I've seen this clue in The Irish News.

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