Really poor (or not unorthodox) training method (4,4)
I believe the answer is:
role play
'training method' is the definition.
(role play might be used to train someone)
'really poor or not unorthodox' is the wordplay.
'not' indicates named letters should be taken away.
'unorthodox' indicates anagramming the letters.
'really'+'poor'='reallypoor'
'reallypoor' with 'or' removed is 'reallypo'.
'reallypo' with letters rearranged gives 'ROLE-PLAY'.
(Other definitions for role play that I've seen before include "Act a part" , "Acting" , "Take part" .)