Pleasure taking in area: area and its animals (5)
I believe the answer is:
fauna
'animals' is the definition.
(I've seen this before)
'pleasure taking in area area' is the wordplay.
'pleasure' becomes 'fun' (I've seen this before).
'taking in' is an insertion indicator.
'area' becomes 'a' (maths abbreviation).
'area' becomes 'a' (maths abbreviation).
'fun' placed around 'a' is 'faun'.
'faun'+'a'='FAUNA'
'and its' is the link.
This may not be correct. Some or all of it may be part of another bit of the clue.
(Other definitions for fauna that I've seen before include "Animal kingdom" , "Flora and - -" , "Animals of a region or habitat" , "list of animals" , "Animal life of given region" .)