Tell on, creating a rift (5)
I believe the answer is:
split
'rift' is the definition.
(thesaurus)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for split that I've seen before include "ice cream concoction" , "share out" , "Divide, break apart" , "Divorce - Adriatic city" , "Cut, cleft" .)