Nonsense some might swallow? (5)
I believe the answer is:
tripe
'nonsense' is the definition.
(informal term for nonsense or false information)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for tripe that I've seen before include "Rot" , "What some northerners eat" , "Edible nonsense?" , "Ruminant's stomach, prepared for cooking" , "Edible entrails" .)