Crossword Genius

Flier uncovered book of navigational routes (7)

Ross

I believe the answer is:

ortolan

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'flier' is the definition.
(ortolan is a kind of birdanimal)

I can't explain the remainder of the clue.

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(Other definitions for ortolan that I've seen before include "One flying" , "Flier" , "Bird" , "high-flying singer" , "European bunting" .)

I've seen this clue in The Times.
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