Quantity of liquid provided by graduates almost entirely (8)
I believe the answer is:
basinful
'quantity of liquid' is the definition.
(amount of liquid held by a basin)
'by graduates almost entirely' is the wordplay.
'by' is a charade indicator (letters next to each other).
'graduates' becomes 'BAs' (people with Bachelor of Arts degrees).
'almost' means to remove the last letter (almost the whole word is kept).
'entirely' becomes 'sinful' (I can't justify this - if you can you should believe this answer much more).
'bas' with its final letter taken off is 'ba'.
'ba' next to 'sinful' is 'BASINFUL'.
'provided' is the link.
Can you help me to learn more?
(Other definitions for basinful that I've seen before include "Quantity of water" , "Capacity of a large bowl" , "More than enough" .)