Crossword Genius

Pilot with long limbs, good at higher altitude (7)

Ross

I believe the answer is:

biggles

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

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for biggles that I've seen before include "Fictional Royal Flying Corps hero" , "Pilot" , "W. E. Johns's flying ace" , "Hero of books by WE Johns" .)

I've seen this clue in The Independent.
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