The most common and most likely answer to this crossword clue is the 8 letter word TRUMPERY
I've seen this crossword clue in The Guardian
T
R
U
M
P
E
R
Y
More clues leading to the result TRUMPERY
- Not false, lines about politician's foolish talk
- Attempt to grab seat close to ringside? Rubbish!
- Seek to snatch back last of the trinkets
- Attempt to squeeze behind back of settee, finding trash
- Rubbish “politician” stuffs more balanced adversary, finally
- Rubbish President over early, oddly
- To endlessly bellow lines is worthless ostentation
- Go without sleeveless jumpers which may amount to gaudy tat
- Victor on the cricket field with little yen for rubbish
Buddy explains!

The straight part
We know that "Rubbish" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case rubbish = trumpery.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 TRUMPERY mean?
TRUMPERY noun- Worthless finery; bric-a-brac or junk.
- Nonsense.
- Deceit; fraud.
- Gaudy but of no value.