Misstep that could make shoe feel uncomfortable? (4,2,3,6)
I believe the answer is:
slip of the tongue
'misstep' is the definition.
(thesaurus)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for slip of the tongue that I've seen before include "a small error" , "Error in words" , "vocal error" , "mistake one hears" .)