A tense "You've got it coming to you!" (6)
I believe the answer is:
future
'a tense' is the definition.
(I know that future is a type of tense)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for future that I've seen before include "Beyond the present" , "Hereafter" , "Outlook" , "What is yet to pass" , "What's yet to come" .)