Former Mexican culture with a final letter, etc changed (5)
I believe the answer is:
aztec
'former mexican' is the definition.
'aztec' can be an answer for 'mexican' (I've seen this before). I'm unsure of the 'former' bit.
'culture with a final letter etc changed' is the wordplay.
'culture with' becomes 'a' (I can't explain this - if you can you should give a lot more credence to this answer).
'a final letter' becomes 'Z' (in the alphabet).
'changed' indicates anagramming the letters.
'etc' with letters rearranged gives 'tec'.
'a'+'z'+'tec'='AZTEC'
Can you help me to learn more?
(Other definitions for aztec that I've seen before include "Former inhabitant of Mexico" , "Native of old Mexico" , "Early Mex. People" , "Such as Moctezuma" , "Person of earlier Mexican civilization" .)