Trade in lead sculpture (4)
I believe the answer is:
deal
'trade in' is the definition.
(thesaurus)
'lead sculpture' is the wordplay.
'sculpture' indicates anagramming the letters.
'lead' anagrammed gives 'DEAL'.
(Other definitions for deal that I've seen before include "Buy and sell" , "bargain > timber" , "Pass around (e.g. cards)" , "Business arrangement in timber" , "Distribute cards or do business" .)