A donkey has one just like a turkey, note (3)
I believe the answer is:
key
'note' is the definition.
(thesaurus)
'a donkey has one just like a turkey' is the wordplay.
'KEY' is hidden in amongst the letters.
But, I am unsure how this is indicated.
Can you help me to learn more?
(Other definitions for key that I've seen before include "Lock undoer" , "Of crucial importance" , "It can open" , "Vital" , "explanation" .)