Soldiers may find it boring (5)

I believe the answer is:

drill

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'boring' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

(Other definitions for drill that I've seen before include "Dental assistant" , "Put a hole in" , "strong twilled cotton" , "Tool; military training" , "Material - exercise" .)

I've seen this clue in the Evening Standard.

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