Mint upset with this metalworker (8)
I believe the answer is:
tinsmith
'metalworker' is the definition.
(I know that tinsmith is a type of blacksmith)
'mint upset with this' is the wordplay.
'upset with' indicates an anagram.
'mint' anagrammed with 'this' can make 'TINSMITH'.
(Other definitions for tinsmith that I've seen before include "A craftsman" , "Metal worker" , "Maker of articles with metal, symbol Sn" , "Sn worker" , "Possible forger" .)