Commission from East shunned by upper-class prig (4)
I believe the answer is:
snob
'prig' is the definition.
(I know that prig can be written as snob)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for snob that I've seen before include "One for whom social status matters" , "Looker-down on others" , "Person with pretensions to higher social status" , "who puts on airs" , "Toffee-nose" .)