Watch ham going unfinished at gallery's opening (8)
I believe the answer is:
spectate
'watch' is the definition.
(I know that spectate is a more specific form of the action the watch)
'at gallery's opening' is the wordplay.
'at' is a charade indicator (letters next to each other).
'gallery' becomes 'tate' (Tate Modern, Tate Britain etc).
'opening' becomes 'spec' (I can't explain this - if you can you should believe this answer much more).
'tate' after 'spec' is 'SPECTATE'.
'ham going unfinished' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for spectate that I've seen before include "View" , "Look on (at a match)" , "Perhaps enjoy sport" , "Watch (a game, etc)" , "Watch (at sports event)" .)