Pour out of brigade canteen (6)
I believe the answer is:
decant
'pour out' is the definition.
('decant' can be a synonym of 'pour out')
'of brigade canteen' is the wordplay.
'of' indicates a hidden word.
'DECANT' can be found hidden inside 'brigade canteen'.
(Other definitions for decant that I've seen before include "Take (wine) off lees" , "Pour wine from bottle into table vessel" , "Discharge" , "Pour from bottle into table container, say wine" , "Gradually pour from one container to another" .)