Coffee or port (5)
I believe the answer is:
mocha
I believe this is a double definition.
'coffee' is the first definition.
(type of coffee drink)
'port' is the second definition.
(I've seen this before)
'or' acts as a link.
(Other definitions for mocha that I've seen before include "Coffee flavour" , "Arabian coffee" , "Deep brown; a fine coffee" , "Fine quality coffee" , "Strong dark coffee" .)