Spanish speaker is unable to answer very naughty boy? (10)
I believe the answer is:
cantabrian
'spanish speaker' is the definition.
I know nothing about this answer so I can't tell whether this works.
'unable to answer very naughty boy?' is the wordplay.
'unable to' becomes 'cant' (I've seen this in another clue).
'answer' becomes 'a' (abbreviation eg in Q and A).
'very naughty boy?' becomes 'Brian' (reference to Monty Python's Life of Brian).
'cant'+'a'+'brian'='CANTABRIAN'
'is' is the link.
Can you help me to learn more?
(Another definition for cantabrian that I've seen is " in one region of Spain?".)