Gay in Ghent so upset there are no bars (8,4)
I believe the answer is:
anything goes
'there are no bars' is the definition.
I know nothing about this answer so I can't judge whether this works.
'gay in ghent so upset' is the wordplay.
'upset' indicates an anagram.
'gay'+'in'+'ghent'+'so'='gayinghentso'
'gayinghentso' is an anagram of 'ANYTHING GOES'.
Can you help me to learn more?
(Other definitions for anything goes that I've seen before include "musical - with 17a" , "anarchy?" , "Musical - statement of permissiveness" , "It doesn't matter what one does" , "Cole Porter song/musical" .)