8 down
Shockingly
bad
at
cutting
diamonds,
hand
back
crown
(8)
Shockingly bad at cutting diamonds, hand back crown (8)
hints
0
checks
0
hints
The definition is at the end of the clue.
How the clue works
So hand back crown is your definition — giving up the throne. 'Shockingly' signals an anagram of BAD, and then AT is cut inside ICE (diamonds in slang) to give ICATE, and the whole lot strings together as ABD + ICATE.