Shakespeare character, a feline about to whimper (7)
I believe the answer is:
capulet
'shakespeare character' is the definition.
The definition suggests a singular noun which matches the answer.
'a feline about to whimper' is the wordplay.
'a feline' becomes 'cat' (cat is a kind of feline).
'about' indicates putting letters inside.
'to whimper' becomes 'pule' (synonyms).
'cat' placed around 'pule' is 'CAPULET'.
Can you help me to learn more?
(Other definitions for capulet that I've seen before include "Shakespeare's Juliet's family name" , "Juliet's house" , "lover's house" , "Will's family" , "Veronese family name" .)