Withdrawal of trade? Pure rubbish! (9)
I believe the answer is:
departure
'withdrawal' is the definition.
(thesaurus)
'trade? pure rubbish' is the wordplay.
'rubbish' is an anagram indicator.
'trade'+'pure'='tradepure'
'tradepure' with letters rearranged gives 'DEPARTURE'.
'of' is the link.
(Other definitions for departure that I've seen before include "Exodus" , "Variation from the expected" , "Act of leaving" , "shift" , "change of direction" .)