Do soldiers find it boring? (5)
I believe the answer is:
drill
'boring?' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for drill that I've seen before include "Tool, instruction" , "Monkey" , "Boring machine" , "Hole-making tool" , "Twilled cotton; soldiers' exercise" .)