Crossword Genius

Error discovered by end of term, I wager (7)

Ross

I believe the answer is:

mistake

'error' is the definition.
(I know that error can be written as mistake)

'end of term i wager' is the wordplay.
'end of' indicates one should take the final letters.
'wager' becomes 'stake' (wager in poker).
The final letter of 'term' is 'm'.
'm'+'i'+'stake'='MISTAKE'

'discovered by' acts as a link.

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

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