Bore about a dress (4)
I believe the answer is:
robe
'a dress' is the definition.
(thesaurus)
'bore about' is the wordplay.
'about' indicates an anagram.
'bore' anagrammed gives 'ROBE'.
(Other definitions for robe that I've seen before include "Old cloak for Boer" , "Formal vestment" , "Gown or dress of office" , "Gown, rich dress" , "Loose or formal garment" .)