Her Maj takes a tumble over frock to get compensation! (7)
I believe the answer is:
redress
'compensation' is the definition.
(redress is a kind of compensation)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for redress that I've seen before include "Reparation" , "Set right - compensation" , "Pay" , "Make amends for" , "Prepare again - satisfaction" .)