Squirrel is having a little taste (6)
I believe the answer is:
relish
'taste' is the definition.
(I know that relish is a type of taste)
'squirrel is having a little' is the wordplay.
'a little' indicates a hidden word.
'RELISH' is hidden within 'squirrel is having'.
(Other definitions for relish that I've seen before include "Thoroughly enjoy" , "smack" , "Enjoy; piquant sauce" , "Enthusiastic enjoyment of a condiment" , "Savour; chutney" .)