Servant wants naked procession (7)
I believe the answer is:
pageant
'procession' is the definition.
(I've seen this before)
'servant wants naked' is the wordplay.
'servant' becomes 'page' (a royal servant).
'naked' means to look at the middle letters (outside letters removed so centre is unclothed).
The central letters of 'wants' are 'ant'.
'page'+'ant'='PAGEANT'
(Other definitions for pageant that I've seen before include "Splendid procession, parade" , "Costumed procession" , "Magnificent parade" , "Dramatic performance" , "Neat gap for colourful spectacle" .)