The most common and most likely answer to this crossword clue is the 8 letter word TOPCOATS
I've seen this crossword clue in The Daily Telegraph
T
O
P
C
O
A
T
S
More clues leading to the result TOPCOATS
Buddy explains!

The straight part
We know that "Glosses over" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case glosses over = topcoats.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 TOPCOATS mean?
TOPCOATS noun- A light overcoat.
- A layer of paint or varnish etc. applied after the undercoat.
- To apply a topcoat to.