The most common and most likely answer to this crossword clue is the 8 letter word BELABOUR
B
E
L
A
B
O
U
R
More clues leading to the result BELABOUR
- Book on English party: discuss at length
- Argue excessively in boozy Blue Boar
- Severely criticize a rule Bob concocted
- Identify with Corbynite strike vigorously
- Beat second-rate oriental political party
- Beat black and blue, or get beaten around the head in assault?
- Outside old university see awful rabble making attack
- Heckle with simple political slogan
- Go on and on about graduate work
- Live sex could result in this hit
Buddy explains!

The straight part
We know that "Go on and on" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case go on and on = belabour.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does BELABOUR mean?
BELABOUR verb- To labour about; labour over; work hard upon; ply diligently.
- To beat soundly; thump; beat someone.
- To attack someone verbally.
- To discuss something repeatedly; to harp on.