Port, a rich sweet wine (6)

I believe the answer is:

muscat

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This clue might be a double definition.

'port a rich sweet' is the first definition.
'muscat' can be an answer for 'port' (I've seen this before). I am unsure of the 'a rich sweet' bit.

'wine' is the second definition.
(I know that muscat is a type of wine)

Can you help me to learn more?

(Other definitions for muscat that I've seen before include "Type of 18" , "Type of grape and the capital of Oman" , "Sweet white wine - Omani port" , "Gulf port -- sweet grape" , "Variety of grape - capital of Oman" .)

I've seen this clue in the Evening Standard.

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