Fool drinking seventh and eighth of Guinesses, barred (6)
I believe the answer is:
closed
'barred' is the definition.
'fool drinking seventh and eighth of guinesses' is the wordplay.
'fool' becomes 'clod' (I've seen this before).
'drinking' is an insertion indicator.
'seventh' becomes 's' (this might be a standard abbreviation which I don't know about).
'and' says to put letters next to each other.
'eighth of guinesses' becomes 'e' (8th letter of 'guinesses').
's'+'e'='se'
'clod' placed around 'se' is 'CLOSED'.
Can you help me to learn more?
(Other definitions for closed that I've seen before include "Exclusive" , "Terminated" , "clinched the sale" , "Resolved" , "Not longer open" .)