Shyster keeping exchange rate poor (8)
I believe the answer is:
operator
'shyster' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'exchange rate poor' is the wordplay.
'exchange' indicates anagramming the letters.
'rate'+'poor'='ratepoor'
'ratepoor' anagrammed gives 'OPERATOR'.
'keeping' is the link.
Can you help me to learn more?
(Other definitions for operator that I've seen before include "Person who directs or controls, machine say (8)." , "Person who controls machinery" , "One using an item of equipment" , "Person running a business" , "Mathematical symbol" .)