Shakespearean king, scratching head, is a good listener? (3)
I believe the answer is:
ear
'a good listener?' is the definition.
(I've seen this in another clue)
'shakespearean king scratching head' is the wordplay.
'shakespearean king' becomes 'Lear' (King Lear).
'scratching head' means to remove the first letter (the word's head is removed).
'lear' with its first letter taken away is 'EAR'.
'is' acts as a link.
(Other definitions for ear that I've seen before include "Sense organ" , "Organ inside heart" , "Aural appendage" , "Head of grain" , "A corny bit" .)