Bore strict training (5)
I believe the answer is:
drill
This clue could be a double definition.
'bore' is the first definition.
(bore can mean to drill into something)
'strict training' is the second definition.
'drill' can be an answer for 'training' (drill is a kind of training). I'm unsure of the 'strict' bit.
Can you help me to learn more?
(Other definitions for drill that I've seen before include "Train (by repeated practice)" , "Mollusc that preys on oysters" , "Dental assistant" , "practise" , "Put a hole in" .)