City can produce tongue (5)
I believe the answer is:
latin
'tongue' is the definition.
(Latin is an example)
'city can' is the wordplay.
'city' becomes 'LA' (Los Angeles).
'can' becomes 'tin' (both are metal containers).
'la'+'tin'='LATIN'
'produce' is the link.
(Other definitions for latin that I've seen before include "Classical language" , "Language of old Romans" , "Parent language of French,Romanian" , "Ancestor of French, Romanian" , "Language of Cicero" .)