The most common and most likely answer to this crossword clue is the 6 letter word TRADED
T
R
A
D
E
D
Buddy explains!

The straight part
We know that "Did traffic" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case did traffic = traded.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does TRADED mean?
TRADED verb- To engage in trade.
- To be traded at a certain price or under certain conditions.
- To give (something) in exchange for.
- To give someone a plant and receive a different one in return.
- To do business; offer for sale as for one's livelihood.
- To have dealings; to be concerned or associated (with).