Builder so set on man getting sacked (10)
I believe the answer is:
stonemason
'builder' is the definition.
(thesaurus)
'so set on man getting sacked' is the wordplay.
'getting' means one lot of letters go next to another.
'sacked' indicates anagramming the letters.
'so'+'set'+'on'+'man'='sosetonman'
'sosetonman' with letters rearranged gives 'STONEMASON'.
(Other definitions for stonemason that I've seen before include "manual worker" , "Man's on toes (anag) - craftsman" , "Architectural carver" , "Construction worker" , "Artisan builder" .)