Banter easily wafted away (5)

I believe the answer is:

chaff

I'm a little stuck... Click here to teach me more about this clue!

'banter' is the definition.
('chaff' can be a synonym of 'banter')

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for chaff that I've seen before include "It's separated from wheat during threshing" , "Husks - jokes" , "Light-hearted banter" , "something worth little" , "Refuse from threshing" .)

I've seen this clue in the Evening Standard.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.