Sound like an ass welcoming foreign visitor to shop (6)
I believe the answer is:
betray
'shop' is the definition.
(I've seen this before)
'sound like an ass welcoming foreign visitor' is the wordplay.
'sound like an ass' becomes 'bray' (I've seen this before).
'welcoming' is an insertion indicator (in sense of 'inviting in').
'foreign visitor' becomes 'et' (I can't explain this - if you can you should believe this answer much more).
'bray' going around 'et' is 'BETRAY'.
'to' is the link.
Can you help me to learn more?
(Other definitions for betray that I've seen before include "Be disloyal to, abuse trust" , "Sell down the river" , "Double-cross like Judas" , "'Deceive, break trust (6)'" , "Let down" .)