Bureau no longer slipping? (6)
I believe the answer is:
office
'bureau' is the definition.
(I know that bureau can be written as office)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for office that I've seen before include "Position in government?" , "Business room or religious rite" , "Job - place of work" , "Place for administration business" , "Subsidiary" .)