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'm unsure of the 'wrongfully' bit.
'leader of uprising to begin with' is the wordplay.
'leader' becomes 'ist' (I can't explain this - if you can you should believe this answer much more).
'uprising' is a reversal indicator.
'to begin with' means one lot of letters go next to another.
'of' in reverse letter order is 'fo'.
'ist' put 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" .)