Crossword Genius

Traffic in March moving easily at first (5)

Ross

I believe the answer is:

trade

'traffic' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

(Other definitions for trade that I've seen before include "Deal - occupation" , "job" , "Calling" , "Buy and sell in business" , "Transaction" .)

I've seen this clue in The Times.
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