Cancels short break from college with popular policeman (8)
I believe the answer is:
rescinds
'cancels' is the definition.
(rescinding is a kind of cancelling)
'short break from college with popular policeman' is the wordplay.
I cannot quite see how this works, but
'from' could be 'in' (I've seen this in other clues) and 'in' is found within the answer.
'college' could be 'c' and 'c' is present in the answer.
'policeman' could be 'ds' (I've seen this in other clues) and 'ds' is located in the answer.
'short break' could be 'res' (I've seen this in other clues) and 'res' is located in the answer.
No letters remain.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for rescinds that I've seen before include "Cancels, law or rule" , "Cancels officially" , "Repeals or cancels, say a law" , "Countermands" , "Repeals or cancels - discerns accordingly" .)