Dressing it up in Odd Couple (8)
I believe the answer is:
poultice
'dressing' is the definition.
(I've seen this before)
'it up in odd couple' is the wordplay.
'up' is an anagram indicator.
'in' is an insertion indicator.
'odd' is an anagram indicator.
'it' is an anagram of 'ti'.
'couple' anagrammed gives 'poulce'.
'ti' put inside 'poulce' is 'POULTICE'.
(Other definitions for poultice that I've seen before include "Application to reduce inflammation" , "Soft material wrapped in cloth to relieve inflammation" , "It relieves inflammation" , "Heated cloth" , "Heated medical application for drawing pus" .)