Silver coin in tin belonging to someone from Barcelona? (7)
I believe the answer is:
catalan
'belonging to someone from barcelona?' is the definition.
(relating to Catalonia in Barcelona)
'silver coin in tin' is the wordplay.
'silver coin' becomes 'tala' (type of Samoan coin).
'in' is an insertion indicator.
'tin' becomes 'can' (synonyms).
'tala' put inside 'can' is 'CATALAN'.
(Other definitions for catalan that I've seen before include "One from NE Spain" , "Language of northeast Spain" , "European language" , "From one Spanish region" , "Language of NE Spain" .)