Travelling regularly -- going by air, making a new start (6)

I believe the answer is:

plying

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'travelling regularly' is the definition.
(to ply is to regularly travel on the same route)

I can't explain the rest of the clue.

(Other definitions for plying that I've seen before include "carrying on" , "Travelling a route regularly" .)

I've seen this clue in The Telegraph.

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