Rice dish, very dry in Brazilian port (7)
I believe the answer is:
risotto
'rice dish' is the definition.
(I've seen this before)
'very dry in brazilian port' is the wordplay.
'very' becomes 'so' (I've seen this in other clues).
'dry' becomes 'tt' (abbreviation for teetotal).
'in' is an insertion indicator.
'brazilian port' becomes 'rio' (I've seen this before).
'so'+'tt'='sott'
'sott' inserted within 'rio' is 'RISOTTO'.
(Other definitions for risotto that I've seen before include "scoff" , "You cook it in stock" , "Italian dish of rice, meat and vegetables" , "Italian course" , "Italian food" .)