Flyer likely to get down? (8)
I believe the answer is:
bluebird
'flyer' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'likely to get down?' is the wordplay.
'likely' becomes 'bird' (I can't justify this - if you can you should believe this answer much more).
'to get' says to put letters next to each other.
'down?' becomes 'blue' (both can mean sad).
'bird' after 'blue' is 'BLUEBIRD'.
Can you help me to learn more?
(Other definitions for bluebird that I've seen before include "Fast car - or boat" , "US flier (but never seen over the white cliffs of Dover)" , "American avian" , "Racing car" , "Donald Campbell's speedboat - relative of thrush" .)