Notice cut, we hear, that's worth viewing (6)
I believe the answer is:
scenic
'worth viewing' is the definition.
(I've seen this before)
'notice cut we hear that's' is the wordplay.
I cannot really understand how this works, but
'that's' could be 'sc' (short for Latin scilicet- 'it follows' or 'that is) and 'sc' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for scenic that I've seen before include "They are usually the long way round!" , "Offering pleasant views, say route" , "Having nice views along the way" , "Like beautiful location" , "Pretty" .)