Commerce is traditional with English (5)
I believe the answer is:
trade
'commerce' is the definition.
(I know that trade is a type of commerce)
'traditional with english' is the wordplay.
'traditional' becomes 'trad' (abbreviation - especially in music 'trad jazz').
'with' is a charade indicator (letters next to each other).
'english' becomes 'E' (abbreviation).
'trad'+'e'='TRADE'
'is' acts as a link.
(Other definitions for trade that I've seen before include "Commercial exchange of goods and services" , "Buy and sell, barter" , "A skilled craft to earn living" , "Dealing in goods" , "Give and receive (blows)" .)