It can be boring for the soldiers (5)

I believe the answer is:

drill

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'it can be boring for the soldiers' is the definition.
The definition suggests a singular noun which matches the answer.

This is all the clue.

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(Other definitions for drill that I've seen before include "Military training; bore" , "practise" , "Dental assistant" , "Material - exercise" , "Tool; military training" .)

I've seen this clue in the Evening Standard.

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