Bore with repeated exercises? (5)

I believe the answer is:

drill

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'bore' is the definition.
(bore can mean to drill into something)

I cannot understand how the remainder of the clue works.

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(Other definitions for drill that I've seen before include "Rehearsal of the procedure to be followed in an emergency" , "Material - exercise" , "strong twilled cotton" , "Tool, instruction" , "Exercise - bore a hole" .)

I've seen this clue in The Irish Independent.

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