Flier poet drops in (4)
I believe the answer is:
lark
'flier' is the definition.
(lark is a type of bird)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for lark that I've seen before include "Mischievous activity" , "Early bird with morning song" , "Early riser" , "Songbird - bit of fun" , "Fool" .)