Aggravating to dress in – I have a few (9)
I believe the answer is:
wearisome
'aggravating' is the definition.
(thesaurus)
'dress in i have a few' is the wordplay.
'dress in' becomes 'wear' (I've seen this before).
'have' means one lot of letters go next to another.
'a few' becomes 'some' (I've seen this before).
'wear'+'i'+'some'='WEARISOME'
'to' acts as a link.
(Other definitions for wearisome that I've seen before include "pestilential" , "Boring" , "Tedious, tiring" , "Vexatious" , "Trying" .)