Rent not collected by different departments should be marked (7)
I believe the answer is:
stamped
'be marked' is the definition.
(thesaurus)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for stamped that I've seen before include "Brought the foot down loudly" , "trampled" , "made an impression" , "Walked noisily or angrily" , "Impressed" .)