Calm surrounds opening of gala appeal about wildlife reserve (9)
I believe the answer is:
serengeti
'wildlife reserve' is the definition.
'serengeti' can be an answer for 'reserve' (I've seen this before). I am not certain of the 'wildlife' bit.
'calm surrounds opening of gala appeal about' is the wordplay.
'calm' becomes 'serene' (synonyms).
'surrounds' means one lot of letters goes inside another.
'opening of' says to take the initial letters.
'appeal' becomes 'it' ('it' can mean something attractive or appealing).
'about' says the letters should be written backwards.
The first letter of 'gala' is 'g'.
'it' back-to-front is 'ti'.
'serene' enclosing 'g' is 'serenge'.
'serenge'+'ti'='SERENGETI'
Can you help me to learn more?
(Other definitions for serengeti that I've seen before include "Afr. plain; green site (anag.)" , "African plain noted for wildlife" , "Vast plain" , "region in Tanzania" , "Tanzanian plain renowned for its wildlife" .)