Prepares to take off one among deductions from pay (6)

I believe the answer is:

taxies

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'prepares to take off' is the definition.
(I've seen this in another clue)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for taxies that I've seen before include "Of aircraft, moves a long ground under own power" , "Moves into position (for takeoff?)" .)

I've seen this clue in The Times.

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