Well-heeled type angry about EU split (7)
I believe the answer is:
croesus
'well-heeled type' is the definition.
(famously wealthy Lydian king)
I don't understand how the remainder of the clue works.
(Other definitions for croesus that I've seen before include "Proverbial rich man" , "One famously loaded" , "Person of great wealth" , "King, a byword for wealth" , "Fabulously wealthy man" .)