Terry's phone's cut! (3)
I believe the answer is:
tel
'terry's phone's' is the definition.
'tel' can be an answer for 'phone's' (short for telephone). I am not sure about the 'terry's' bit.
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for tel that I've seen before include "Ancient mound in Arab lands" , "Ancient mound in Middle East" , "Small number" , "-- Aviv; old mound" , "Phone number (abbrev.)" .)