Choke on chestnut (3)
I believe the answer is:
gag
This might be a double definition.
'choke on' is the first definition.
(thesaurus)
'chestnut' is the second definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
Can you help me to learn more?
(Other definitions for gag that I've seen before include "Stifle; joke" , "A palindromic joke or muzzle" , "Choke; joke" , "Humorous anecdote or remark" , "Make quiet" .)