Drink fermented in iron pot (5,4)
I believe the answer is:
pinot noir
'drink' is the definition.
(Pinot noir is an example)
'fermented in iron pot' is the wordplay.
'fermented' indicates anagramming the letters.
'in'+'iron'+'pot'='inironpot'
'inironpot' anagrammed gives 'PINOT NOIR'.
(Other definitions for pinot noir that I've seen before include "no white wine" , "Red wine grape" , "Wine grape variety" , "Type of red" , "18 [WINE]" .)