Workers putting minced veal into a vessel (6)
I believe the answer is:
slaves
'workers' is the definition.
(slave is a kind of worker)
'minced veal into a vessel' is the wordplay.
'minced' indicates anagramming the letters.
'into' is an insertion indicator.
'a vessel' becomes 'ss' ().
'veal' is an anagram of 'lave'.
'lave' going inside 'ss' is 'SLAVES'.
'putting' acts as a link.
(Other definitions for slaves that I've seen before include "Humans owned by humans" , "Servants with no freedom" .)