Unfinished game receives not so much approval (8)
I believe the answer is:
blessing
'approval' is the definition.
('blessing' can be a synonym of 'approval')
'unfinished game receives not so much' is the wordplay.
'unfinished game' becomes 'bing' (I can't explain this - if you can you should believe this answer much more).
'receives' is an insertion indicator.
'not so much' becomes 'less' (I've seen this before).
'bing' going around 'less' is 'BLESSING'.
(Other definitions for blessing that I've seen before include "Asking God to look favourably on" , "Glibness in benediction" , "Approval" , "Consecration" , "Benefit, boon" .)