Dismissal of Wellington? (4)
I believe the answer is:
boot
I believe this clue is a double definition.
'dismissal' is the first definition.
(thesaurus)
'wellington?' is the second definition.
(Wellington boots are a type of shoe)
'of' acts as a link.
(Other definitions for boot that I've seen before include "Sack" , "Sturdy shoe; start (a computer)" , "Car luggage space; kick" , "Dismiss" , "Hard kick; part of car" .)