Crossword Genius

Rich oil producer wasn't perfectly upright (4-6)

Ross

I believe the answer is:

well-heeled

I'm a little stuck... Click here to teach me more about this clue!

'rich' is the definition.
(I know that rich can be written as well-heeled)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for well-heeled that I've seen before include "Affluent" , "Wealthy" , "Prosperous, rich" , "Comfortably off" .)

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