“Drink? Not I,” you say (3)
I believe the answer is:
tea
'drink? not i you say' is the definition.
'tea' can be an answer for 'drink?' (thesaurus). I'm not certain of the 'not i you say' bit.
'drink? not i you say' is the wordplay.
'drink?' becomes 'it'.
'not' suggests deleting specific letters.
'you say' becomes 'ea' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'it' with 'i' taken out is 't'.
't'+'ea'='TEA'
Can you help me to learn more?
(Other definitions for tea that I've seen before include "Earl Grey?" , "Char" , "Darjeeling, e.g." , "Beverage; meal" , "Infused beverage" .)