Hurt fencing schoolboy champion (7)
I believe the answer is:
paladin
'champion' is the definition.
(I know that champion can be written as paladin)
'hurt fencing schoolboy' is the wordplay.
'hurt' becomes 'pain' (paining is a kind of hurting).
'fencing' is an insertion indicator (to fence can mean to contain or put a limit round).
'schoolboy' becomes 'lad' (lad can mean a young boy).
'pain' enclosing 'lad' is 'PALADIN'.
(Other definitions for paladin that I've seen before include "paragon" , "Medieval champion" , "Heroic knight - aid plan (anag)" , "Knightly champion" , "hero" .)