Rich, goal staggering for powerful ruler (8)

I believe the answer is:

oligarch

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'powerful ruler' is the definition.
'oligarch' can be an answer for 'ruler' (oligarch is a kind of ruler). I'm not sure about the 'powerful' bit.

'rich goal staggering' is the wordplay.
'staggering' is an anagram indicator (letters stagger around).
'rich'+'goal'='richgoal'
'richgoal' with letters rearranged gives 'OLIGARCH'.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for oligarch that I've seen before include "one of small group at top" , "Very rich Russian businessman" , "member of power group" , "Mega-rich Russian with political influence" , "Rich Russian with political influence" .)

I've seen this clue in The Telegraph.

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