Yucatan native is allowed to answer (4)
I believe the answer is:
maya
'yucatan native' is the definition.
(I've seen this in another clue)
'is allowed to answer' is the wordplay.
'is allowed to' becomes 'may' (I've seen this in another clue).
'answer' becomes 'a' (abbreviation eg in Q and A).
'may'+'a'='MAYA'
(Other definitions for maya that I've seen before include "Indian" , "Member of a native American family living in Mexico until the 15th century" , "People of areas such as Guatemala" , "Central Amer. people" , "The illusory world" .)