Extra Times edition’s first for so long (3-3)
I believe the answer is:
bye-bye
'for so long' is the definition.
(I've seen this before)
'extra times edition's first' is the wordplay.
'extra' becomes 'bye' (cricket term).
'times' becomes 'by' (both can mean 'multiplied by').
'edition's first' becomes 'e' (1st letter of 'edition').
'bye'+'by'+'e'='BYE-BYE'
(Other definitions for bye-bye that I've seen before include "Ciao!" , "Ta-ta" , "Au revoir for juniors?" , "See you" , "Adieu" .)