Attendant losing time working as messenger (7)
I believe the answer is:
courier
'messenger' is the definition.
(I know that messenger can be written as courier)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for courier that I've seen before include "Messenger, often on a motorbike" , "Messenger carrying papers etc, perhaps on motorbike" , "Person delivering a parcel, say, by motorcycle" , "guide for tourists" , "Messenger, runner" .)