The most common and most likely answer to this crossword clue is the 6 plus 3 letter word POLISH OFF
I've seen this crossword clue in The Guardian
P
O
L
I
S
H
O
F
F
More clues leading to the result POLISH OFF
- Tongue rotten, put away
- Eat: start on tongue
- Dispose of foolish nonsense in contrasting volumes
- Eliminate language of fear at the outset
- Murder, with bad language beforehand
- Eliminate east European? That’s bad!
- No longer available with gloss finish
- Eliminate European cricket side
- Finish with language on holiday
- European’s gone? Put away
Buddy explains!

The straight part
We know that "Dispose of" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case dispose of = polish off.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.