Dismissal of footwear (4)
I believe the answer is:
boot
I believe this clue is a double definition.
'dismissal' is the first definition.
(thesaurus)
'footwear' is the second definition.
(boot is a kind of footwear)
'of' is the link.
(Other definitions for boot that I've seen before include "Profit" , "Amass and hide away" , "Hard kick (colloq.)" , "Item of footwear" , "Kick; start (a computer)" .)