6 across
Simpleton
with
broken
leg
he
can’t
magically
fix
(6)
Simpleton with broken leg he can’t magically fix (6)
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The definition is at the end of the clue.
How the clue works
Look at he can't magically fix — that's your definition, the Harry Potter term for a non-magical person. The wordplay gives you MUG (simpleton) followed by GLE, which is an anagram ("broken") of LEG.