Very debatable as being a good clue, agree with you there BigDave44, yet , always appreciate your input for sure!
What's wrong- makes you think what's the Matter. Yet, where does snarl come into it- it is like a red herring?! No wonder kayakamina thought it may be something else + no wonder methought it could be mutter( snarl + sounds like matter). Just made an educated guess as did not have the crossword infront of me. An intelligent person who is kind is a genius- therefore BigDave44- you are a genius :-) Always have much respect for Kayakamina, too :-) Most people here are truly lovely as well as knowledgeable:-)Yet, will ignore those who do not fit into the first category.
BigDave44 + Kayakamina- you are stars- so big hugs to you both :-) ;-)Ciao for now, Bea :-)