Strike illegally, putting crown jewels in danger? (3,5,3,4)
I believe the answer is:
hit below the belt
'illegally putting crown jewels in danger?' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.
'strike' is the wordplay.
I cannot quite understand how this works, but
'strike' could be 'belt' and 'belt' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Another definition for hit below the belt that I've seen is " Say something unfair".)