Teasing of a flier at some length? (5)
I believe the answer is:
chaff
'teasing' is the definition.
(thesaurus)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for chaff that I've seen before include "Rubbish" , "Shucks" , "something worth little" , "Light banter - husks from corn" , "Worthless material (from corn)" .)