Dressing Victor in ornamental plume? (11)
I believe the answer is:
vinaigrette
'dressing' is the definition.
(I know that vinaigrette is a type of dressing)
'victor in ornamental plume?' is the wordplay.
'victor' becomes 'V' (phonetic alphabet: alpha, bravo, charlie etc.).
'ornamental plume?' becomes 'aigrette' (I've seen this in another clue).
'v'+'in'+'aigrette'='VINAIGRETTE'
(Other definitions for vinaigrette that I've seen before include "that will be put on the table in France" , "sharp dressing" , "French dressing" , "Salad dressing" .)