Quantity of wine, say, knocked back in boozy spree (5)
I believe the answer is:
binge
'boozy spree' is the definition.
'quantity of wine say knocked back' is the wordplay.
'quantity of wine' becomes 'bin' (a bin is a type of container for wine bottles).
'say' becomes 'eg'.
'knocked back' says the letters should be written in reverse.
'eg' written backwards gives 'ge'.
'bin'+'ge'='BINGE'
'in' is the link.
(Other definitions for binge that I've seen before include "Prolonged drinking session" , "Bust" , "Overindulge" , "Immoderate indulgence" , "Period of overindulgence" .)