Don tries to break actual drill (5,9)
I believe the answer is:
dress rehearsal
'don tries to break actual drill' is the definition.
I can't tell whether this defines the answer.
'don tries to break actual drill' is the wordplay.
'don' becomes 'dress' (I've seen this before).
'tries' becomes 'hears' ('hear' can be a synonym of 'try').
'to break' indicates putting letters inside.
'actual drill' becomes 'real' (I am not sure about this - if you are sure you should believe this answer much more).
'hears' placed inside 'real' is 'rehearsal'.
'dress'+'rehearsal'='DRESS REHEARSAL'
Can you help me to learn more?
(Other definitions for dress rehearsal that I've seen before include "last practice" , "trial run" , "last chance to get things right" , "Strip show doesn't need such" , "Final play run-through" .)