Regularly run riot on party wine (5)
I believe the answer is:
douro
'wine' is the definition.
Both the definition and answer are singular nouns.
Perhaps they are linked in a way I don't understand?
'regularly run riot on party' is the wordplay.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
'on' says to put letters next to each other.
'party' becomes 'do' (do is a kind of party).
'run'+'riot'='runriot'
The alternate letters of 'runriot' are 'uro'.
'uro' after 'do' is 'DOURO'.
Can you help me to learn more?
(Other definitions for douro that I've seen before include "Hollow bubbling sound" , "Iberian river" , "European runner" .)