The huge difference a comma can make? (9,6)
I believe the answer is:
butterfly effect
'the huge difference a comma' is the definition.
I know nothing about this answer so I cannot tell whether this works.
'can make?' is the wordplay.
I cannot really understand how this works, but
'can' could be 'butt' (synonyms) and 'butt' is found within the answer.
'make?' could be 'effect' (effecting is a kind of making) and 'effect' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for butterfly effect that I've seen is " Idea that a small change can have major consequences elsewhere".)