Wine in the making, bishopric worth watching (4-3)
I believe the answer is:
must-see
'worth watching' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.
'wine in the making bishopric' is the wordplay.
I cannot really see how this works, but
'wine' could be 'must' (I have seen 'Unfermented wine ' mean 'must' so perhaps 'wine' could also mean 'must') and 'must' is found in the answer.
'bishopric' could be 'see' (I've seen this in another clue) and 'see' is found within the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for must-see that I've seen before include "Remarkable sight" , "Unmissable" .)