On reflection, fast talking is normal (3)
I believe the answer is:
par
'is normal' is the definition.
(thesaurus)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for par that I've seen before include "What is normal - . . . for the course" , "Expected golf hole score" , "Norm" , "Standard number of strokes for a golf hole" , "Average score for good golf player" .)