Sort of watch on TV? (7)
I believe the answer is:
digital
'sort of watch' is the definition.
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for digital that I've seen before include "Type of clock" , "(Watch) without hands" , "Displaying in numbers like some watches" , "Showing data in numbers" , "As opposed to analogue?" .)