African plain gets Irene excited (9)
I believe the answer is:
serengeti
'african plain' is the definition.
(I've seen this before)
'gets irene excited' is the wordplay.
'excited' indicates anagramming the letters.
'gets'+'irene'='getsirene'
'getsirene' is an anagram of 'SERENGETI'.
(Other definitions for serengeti that I've seen before include "African ecosystem" , "area of Tanzania" , "Green ties (anag.)" , "Tanzanian national park area" , "place to watch game" .)