Give planet credit by attending a rich ruler (9)
I believe the answer is:
plutocrat
'a rich ruler' is the definition.
'plutocrat' can be an answer for 'ruler' (I have seen 'Wealthy ruler ' mean 'plutocrat' so perhaps 'ruler' could also mean 'plutocrat'). I am not sure about the 'a rich' bit.
'give planet credit by attending' is the wordplay.
'give' says to put letters next to each other.
'planet' becomes 'pluto' (Pluto is an example).
'credit by' becomes 'cr' (abbreviation. I am not sure about the 'by' bit.).
'attending' becomes 'at' (e.g. at school means attending school).
'pluto' next to 'cr' is 'plutocr'.
'plutocr'+'at'='PLUTOCRAT'
Can you help me to learn more?
(Other definitions for plutocrat that I've seen before include "Person who derives power from wealth" , "Capitalist" , "One powerful through wealth" , "one wealthy" , "One rich and powerful" .)