No d-drink? Drink! (6)
I believe the answer is:
noggin
'drink' is the definition.
(drink measurement, typically a quarter of a pint)
'no d-drink?' is the wordplay.
'd-drink?' becomes 'ggin' ('gin' said with a stutter like 'drink' was; gin is a kind of drink).
'no'+'ggin'='NOGGIN'
(Other definitions for noggin that I've seen before include "alcoholic drink?" , "Small measure of liquid" , "Small mug - wooden cup" , "Measure of alcohol, about a quarter pint" , "Small measure of spirits or mug" .)