Times article has last word, incidentally (2,3,3)
I believe the answer is:
by the bye
'incidentally' is the definition.
(synonyms)
'times article has last word' is the wordplay.
'times' becomes 'by' (both can mean 'multiplied by').
'article' becomes 'the' (the definite article in English).
'has' is a charade indicator (letters next to each other).
'last word' becomes 'bye' (word said before parting).
'by'+'the'+'bye'='BY THE BYE'
(Other definitions for by the bye that I've seen before include "Parenthetically" , "Incidentally" , "In passing" .)