Light-hearted banter is corny rubbish? (5)
I believe the answer is:
chaff
This could be a double definition.
'light-hearted banter' is the first definition.
(I've seen this before)
'corny rubbish?' is the second definition.
'chaff' can be an answer for 'rubbish?' (I've seen this before). I'm not certain of the 'corny' bit.
'is' acts as a link.
Can you help me to learn more?
(Other definitions for chaff that I've seen before include "Winnowed husks of grain" , "something worth little" , "It's separated from wheat during threshing" , "Shucks" , "Rubbish" .)