Poor person may beg for this reform (6)
I believe the answer is:
change
'for this reform' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for change that I've seen before include "Put on different clothes" , "Alter for small coins" , "Mutate or transform" , "Money returned as balance after purchase" , "difference" .)