Drunk venetian left an anonymous message (9)
I believe the answer is:
valentine
'an anonymous message' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Maybe you can see an association between them that I don't see?
'drunk venetian left' is the wordplay.
'drunk' indicates anagramming the letters.
'left' becomes 'l' (common abbreviation).
'venetian'+'l'='venetianl'
'venetianl' anagrammed gives 'VALENTINE'.
Can you help me to learn more?
(Other definitions for valentine that I've seen before include "A loving greeting card sent on February 14th" , "Potential lover" , "Feb 14 card" , "February patron saint of lovers" , "Anonymous love token from an admirer" .)