The joker who helped you get the boot off? (3,6)
I believe the answer is:
'the joker' is the definition.
(I have seen 'Practical joker' mean 'leg-puller' so perhaps 'joker' could also mean 'leg-puller')
I can't explain the rest of the clue.
Can you help me to learn more?
(Another definition for leg puller that I've seen is " Prankster".)