Short trip by plane taking off first thing (5)

I believe the answer is:

light

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'short' is the definition.
(similar in meaning)

I can't explain the remainder of the clue.

(Other definitions for light that I've seen before include "Not having full load" , "Mild" , "Weightless; lamp" , "without difficulty" , "Ignite; of little weight" .)

I've seen this clue in The Independent.

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