Possible Clues:

• Arawakan language of the West Indies
• Member of an extinct Indian tribe of the West Indies
• Indigenous Caribbean language
• Aboriginal Bahamian people (hidden in "mountainous")
• Best not to get confused about extinct Indians
• An extinct Caribbean language
• Early Hispaniola people
• Archaic language used in Britain, once
• Language Caribbean used to speak and southeast Asian understand when spoken
• Extinct language of Britain, officially