Wrongfully insert leader of uprising to begin with (5)
I believe the answer is:
foist
'wrongfully insert' is the definition.
'foist' can be an answer for 'insert' (foisting is a kind of inserting). I am not sure about the 'wrongfully' bit.
'leader of uprising to begin with' is the wordplay.
'leader' becomes 'ist' (I can't justify this - if you can you should give a lot more credence to this answer).
'uprising' says the letters should be written backwards.
'to begin with' is a charade indicator (letters next to each other).
'of' back-to-front is 'fo'.
'ist' after 'fo' is 'FOIST'.
Can you help me to learn more?
(Other definitions for foist that I've seen before include "Pass off, impose (on)" , "Impose (upon)" , "To - something on a person is to impose it" , "Impose, inflict" , "Cause person to accept something unwelcome or unwanted" .)