The most common and most likely answer to this crossword clue is the 10 letter word VARNISHING
V
A
R
N
I
S
H
I
N
G
More clues leading to the result VARNISHING
Buddy explains!

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 VARNISHING mean?
VARNISHING verb- To apply varnish.
- To cover up with varnish.
- To gloss over a defect.
- An application of varnish.