Publican with no end of trade (6)

I believe the answer is:

barter

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

'trade' is the definition.
(I know that trade can be written as barter)

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

Can you help me to learn more?

(Other definitions for barter that I've seen before include "Trade without using money" , "Trade by direct exchange of goods" , "Trade not involving money" , "Exchange goods without using money" , "Trade, haggle" .)

I've seen this clue in The Globe and Mail.

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