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 not certain of 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 believe this answer much more).
'uprising' shows that the letters should be reversed in order.
'to begin with' means one lot of letters go next to another.
'of' backwards 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" .)