Did some boring training with my boss (7)
I believe the answer is:
drilled
'did some boring' is the definition.
(bore can mean to drill down)
'training with my boss' is the wordplay.
'training' becomes 'drill' (drill is a kind of training).
'with' is a charade indicator (letters next to each other).
'my boss' becomes 'ed' (abbreviation for editor, the setter's boss).
'drill'+'ed'='DRILLED'
(Other definitions for drilled that I've seen before include "Bored a hole or trained by repetition" , "Made a hole with a pointed tool" , "soldiers may be treated thus" , "given military instruction" .)