Was confused, greeting Polish centrists in this language (7)
I believe the answer is:
swahili
'this language' is the definition.
(Swahili is an example)
'was confused greeting polish centrists' is the wordplay.
'confused' is an anagram indicator.
'greeting' becomes 'hi' (hi is a kind of greeting).
'polish centrists' becomes 'li' (I can't justify this - if you can you should believe this answer much more).
'was' with letters rearranged gives 'swa'.
'swa'+'hi'+'li'='SWAHILI'
'in' is the link.
Can you help me to learn more?
(Other definitions for swahili that I've seen before include "Language giving us bwana, safari" , "Language widespread in East Africa" , "E. African language" , "Common language of E. Africa" , "Language of Kenya and lingua franca of other African areas" .)