Rule reversed by prince backing one with supervisory role (6)
I believe the answer is:
wallah
'one with supervisory role' is the definition.
'rule reversed by prince backing' is the wordplay.
'rule' becomes 'law' (law is a kind of rule).
'reversed' is a reversal indicator.
'by prince' becomes 'hal' (I've seen this before. I am not sure about the 'by' bit.**).
'backing' says the letters should be written backwards.
'law' reversed gives 'wal'.
'hal' in reverse letter order is 'lah'.
'wal'+'lah'='WALLAH'
Can you help me to learn more?
(Other definitions for wallah that I've seen before include "Indian worker" , "top specialist" , "man in particular role" , "Person in charge of (or specialised in) something (from Hindi)" .)