Officer is swigging superior sauce (6)
I believe the answer is:
coulis
'sauce' is the definition.
(type of sauce)
'officer is swigging superior' is the wordplay.
'officer' becomes 'col' (short for colonel).
'swigging' is an insertion indicator.
'superior' becomes 'u' (I've seen this in other clues).
'col'+'is'='colis'
'colis' enclosing 'u' is 'COULIS'.
(Other definitions for coulis that I've seen before include "Fruit pure" , "Thin vegetable puree" , "Thin sauce made from fruit puree" , "Fruit-puree sauce" .)