Rift created by a broken promise? (6)
I believe the answer is:
breach
'rift' is the definition.
(I know that rift can be written as breach)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for breach that I've seen before include "'Gap, break or hole (6)'" , "Disturbance as of the peace" , "Infringement - gap" , "'A custom more 1 down in the ____ ..." , "Split, break" .)