The most common and most likely answer to this crossword clue is the 5 letter word BEZEL
I've seen this crossword clue in Financial Times
B
E
Z
E
L
More clues leading to the result BEZEL
Buddy explains!
The straight part
We know that "Sloping edge" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sloping edge = bezel.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 BEZEL mean?
BEZEL noun- The sloping edge or face on a cutting tool.
- The oblique side or face of a cut gem; especially the upper faceted portion of a brilliant (diamond), which projects from its setting.
- The rim and flange which encompasses and fastens a jewel or other object, such as the crystal of a watch, in the cavity in which it is set; the collet.
- The panel that covers the front of a computer case, or the panel covering each drive bay that can be removed to install a removable drive that requires external access, such as a CD/DVD-ROM drive, which usually has its own preinstalled bezel.