Current rules reversed about greeting that's heard in Kenya (7)
I believe the answer is:
swahili
'that's heard in kenya' is the definition.
(language of Kenya)
'current rules reversed about greeting' is the wordplay.
'current' becomes 'i' (symbol for electric current).
'rules' becomes 'laws' (law is a kind of rule).
'reversed' shows that the letters should be reversed in order.
'about' is an insertion indicator.
'greeting' becomes 'hi' (hi is a kind of greeting).
'i'+'laws'='ilaws'
'ilaws' in reverse letter order is 'swali'.
'swali' placed around 'hi' is 'SWAHILI'.
(Other definitions for swahili that I've seen before include "Lingua franca of East Africa" , "Language of Kenya and lingua franca of other African areas" , "African tongue" , "heard in parts of Africa" , "Language widely used in East Africa" .)