Outrage surrounding soldier in dress (7)
I believe the answer is:
apparel
'dress' is the definition.
(synonyms)
'outrage surrounding soldier' is the wordplay.
'outrage' becomes 'appal' (synonyms).
'surrounding' means one lot of letters goes inside another.
'soldier' becomes 'RE' (Royal Engineer).
'appal' placed around 're' is 'APPAREL'.
'in' acts as a link.
(Other definitions for apparel that I've seen before include "Garb, clothes" , "Real pap (anag) - clothing" , "Raiment" , "Clothing, things to wear" , "Formal word for clothing" .)