Volume perhaps a couple of pints over (6)
I believe the answer is:
quarto
'volume' is the definition.
The answer and definition can be both human attributes as well as being singular nouns.
Maybe there's a link between them I don't understand?
'a couple of pints over' is the wordplay.
'a couple of pints' becomes 'quart' (I've seen this before).
'over' becomes 'o' (cricket abbreviation).
'quart'+'o'='QUARTO'
'perhaps' acts as a link.
Can you help me to learn more?
(Other definitions for quarto that I've seen before include "Publishing term, four leaves are formed from one sheet" , "Book size resulting in folding one sheet four times" , "Twice-folded paper size" , "Ten-by-eight inch paper" , "Book page size" .)