Language restriction for listener (4)
I believe the answer is:
thai
'language' is the definition.
(Thai is an example)
'restriction for listener' is the wordplay.
'restriction' becomes 'tie'.
'for listener' shows a homophone (sound like).
'tie' is a homophone of 'THAI'.
(Other definitions for thai that I've seen before include "nationality" , "Person from Bangkok?" , "From Bangkok, for example" , "National" , "Sort of eastern cooking" .)