Crossword Genius

Flier poet drops in (4)

Ross

I believe the answer is:

lark

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'flier' is the definition.
(lark is a type of bird)

I can't explain the rest of the clue.

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(Other definitions for lark that I've seen before include "Mischievous activity" , "Early bird with morning song" , "Early riser" , "Songbird - bit of fun" , "Fool" .)

I've seen this clue in The Guardian.
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