Boring routine that may be exhibited by a drill team (9)
I believe the answer is:
treadmill
'boring routine' is the definition.
(I've seen this before)
'may be exhibited by a drill team' is the wordplay.
'drill team' can be anagrammed to 'TREADMILL'.
However, I am not sure how this is indicated.
'that' is the link.
Can you help me to learn more?
(Other definitions for treadmill that I've seen before include "Walking or running exercise device" , "hard labour" , "Wheel turned by walking animals or people" , "It enables one to work out" , "Tiresome job" .)