Animal taking a promenade back (5)
I believe the answer is:
llama
'animal' is the definition.
(thesaurus)
'a promenade back' is the wordplay.
'promenade' becomes 'mall' ('mall' can be a synonym of 'promenade').
'back' is a reversal indicator.
'a'+'mall'='amall'
'amall' in reverse letter order is 'LLAMA'.
'taking' acts as a link.
(Other definitions for llama that I've seen before include "20vian beast" , "S American animal related to the camel" , "Long-necked woolly animal" , "Peruvian transportation" , "provider of wool" .)