It needs watching (5)
I believe the answer is:
video
'it needs watching' is the definition.
The definition suggests a singular noun which matches the answer.
This is the entire clue.
Can you help me to learn more?
(Other definitions for video that I've seen before include "TV/film cassette" , "Record footage" , "Who killed the radio star? (5)" , "Taped film" , "Recorded film cassette" .)