No drink brought back for monster (6)
I believe the answer is:
gorgon
'for monster' is the definition.
(Gorgon is an example)
'no drink brought back' is the wordplay.
'drink' becomes 'grog' (grog is a kind of drink).
'brought back' says the letters should be written in reverse.
'no'+'grog'='nogrog'
'nogrog' backwards is 'GORGON'.
(Other definitions for gorgon that I've seen before include "Mythical female winged monster" , "Mythical Greek woman with snakes as hair" , "Ferocious woman" , "Petrifying woman of myth" , "Mythical sister with snakes for hair" .)