Sales involving animals (5)
I believe the answer is:
seals
'animals' is the definition.
The answer is an example.
'sales involving' is the wordplay.
'involving' indicates anagramming the letters.
'sales' anagrammed gives 'SEALS'.
(Other definitions for seals that I've seen before include "Great swimmers" , "They make an impression" , "they're impressive" , "Animals spotted on coast" , "Makes waterproof" .)