Entertainment area including a collection of animals (5)
I believe the answer is:
fauna
'collection of animals' is the definition.
'fauna' can be an answer for 'animals' (I've seen this before). I am unsure of the 'collection of' bit.
'entertainment area including a' is the wordplay.
'entertainment' becomes 'fun' (fun is something entertaining).
'area' becomes 'a' (maths abbreviation).
'including' is an insertion indicator.
'fun'+'a'='funa'
'funa' going around 'a' is 'FAUNA'.
Can you help me to learn more?
(Other definitions for fauna that I've seen before include "(Region's) animal life" , "Animals of an area or period" , "list of animal life" , "Wild animal life of an era" , "Animal life of an area" .)