Australian in Mexico stop smiling? (6)
I believe the answer is:
gringo
'australian in mexico' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe you can see an association between them that I don't see?
'stop smiling?' is the wordplay.
I cannot really see how this works, but
'stop' could be 'go' (going is a kind of stopping) and 'go' is found in the answer.
'smiling?' could be 'grin' (synonyms) and 'grin' is present in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for gringo that I've seen before include "Latin-American term for English speaker" , "Non-Spanish speaker" , "What the Mexican calls the American" , "English-speaker abroad" .)