Crossword Genius

Two-way traffic, no cash needed (6)

Ross

I believe the answer is:

barter

I'm a little stuck... Click here to teach me more about this clue!

'two-way traffic' is the definition.
'barter' can be an answer for 'traffic' (thesaurus). I am unsure of the 'two-way' bit.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for barter that I've seen before include "Trade by exchanging commodities" , "Trade not involving money" , "Trade without using money" , "Trade or swap" , "Exchange goods without using money" .)

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