Hollywood can produce lingo (5)
I believe the answer is:
latin
'lingo' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'hollywood can' is the wordplay.
'hollywood' becomes 'LA' (Hollywood is a neighbourhood of Los Angeles).
'can' becomes 'tin' (both are metal containers).
'la'+'tin'='LATIN'
'produce' acts as a link.
Can you help me to learn more?
(Other definitions for latin that I've seen before include "The language of Virgil" , "Ancestor of French, Romanian" , "Virgil's tongue" , "Shakespeare's was small, according to Jonson" , "ancient tongue" .)