Outrage about queen turning up in dress (7)
I believe the answer is:
apparel
'dress' is the definition.
(I've seen this before)
'outrage about queen turning up' is the wordplay.
'outrage' becomes 'appal' ('appal' can be a synonym of 'outrage').
'about' means one lot of letters goes inside another.
'queen' becomes 'er' (abbreviation for Elizabeth Regina).
'turning up' says the letters should be written backwards.
'er' backwards is 're'.
'appal' enclosing 're' is 'APPAREL'.
'in' is the link.
(Other definitions for apparel that I've seen before include "costume" , "Garb, clothes" , "Clothing, things to wear" , "Real pap (anag) - clothing" , "Raiment" .)