Less than a pinta! (5)
I believe the answer is:
'less' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for cuppa that I've seen before include "Refreshing brew" , "Drink of tea (informal)" , "Drink of tea (colloq.)" .)