Setter perhaps on and on about flipping nonsense (8)
I believe the answer is:
doggerel
'nonsense' is the definition.
(I've seen this before)
'setter perhaps on and on about flipping' is the wordplay.
I cannot quite understand how this works, but
'setter' could be 'dog' (a setter is a type of dog) and 'dog' is found in the answer.
'on' could be 're' (regarding) and 're' is present in the answer.
The remaining letters 'gel' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for doggerel that I've seen before include "Trite verse" , "Worthless verse - gored leg (anag)" , "Poor quality comic or trivial verse" , "Unpretentious verse" , "Rubbishy verse" .)