Crossword Genius

Instruction to the mechanic might be a bore (3,4)

Ross

I believe the answer is:

oil well

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'a bore' is the definition.

I don't understand how the remainder of the clue works.

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(Other definitions for oil well that I've seen before include "Bore made for fuel" , "Instruction on machine perhaps" , "source of wealth" , "Borehole for petroleum" , "Gusher, perhaps" .)

I've seen this clue in The Globe and Mail.
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