Payment for service? (4)
I believe the answer is:
duty
This clue might be a double definition.
'payment' is the first definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe there's a link between them I don't understand?
'for service?' is the second definition.
(I've seen this before)
Can you help me to learn more?
(Other definitions for duty that I've seen before include "Task; military service" , "Government tax" , "Service - tax - office" , "Service - tax - obligation" , "Tariff" .)