Bore with exercise (5)
I believe the answer is:
drill
I believe this is a double definition.
'bore' is the first definition.
(bore can mean to drill into something)
'exercise' is the second definition.
(military exercise)
'with' acts as a link.
(Other definitions for drill that I've seen before include "Stout cotton cloth" , "Seed machine; baboon" , "Exercise by repeated practice - bore" , "Dental assistant" , "strong twilled cotton" .)