Outside of court commend drill (8)
I believe the answer is:
practise
'drill' is the definition.
(I know that drill can be written as practise)
'outside of court commend' is the wordplay.
'outside of' indicates putting letters inside.
'court' becomes 'ct' (abbreviation used in road names).
'commend' becomes 'praise' (I've seen this in another clue).
'ct' going inside 'praise' is 'PRACTISE'.
(Other definitions for practise that I've seen before include "Do something to improve skill, train" , "Rehearse" , "Drill" , "Be engaged in (profession)" , "Train by repetition" .)