Stirring part of service (8)
I believe the answer is:
teaspoon
'stirring part of service' is the definition.
(part of a tea service that stirs)
This is all the clue.
(Other definitions for teaspoon that I've seen before include "It creates a stir" , "Five millilitres (cookery)" , "5 ml container" , "Not Aesop (anag.)" , "Cooking unit" .)