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' (page can mean a boy servant).
'naked' says to take the centre (outside letters removed so centre is unclothed).
The middle 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" .)