Crossword Genius

Through effort, is bound to fill in the answers to the problems here (8)

Ross

I believe the answer is:

workbook

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'through effort is bound to fill in the answers to the problems here' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

This is the entire clue.

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(Another definition for workbook that I've seen is " Volume of student exercises".)

I've seen this clue in The Irish Times.
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