Sadly robbed of five hundred pounds, about (3)
I believe the answer is:
say
'about' is the definition.
(thesaurus)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for say that I've seen before include "Pronounce" , "State; for instance" , "Utter; for example" , "Speak, declare" , "Utter; e.g." .)