Polish barman, ignoring procedure, makes punch (4)
I believe the answer is:
chin
'punch' is the definition.
(slang term meaning to punch someone on the chin)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for chin that I've seen before include "Could be a double feature" , "Facial feature" , "Jutting part of lower jaw" , "'... up, stay cheerful (4)'" , "Possible double feature?" .)