Royal gathering fell back where bench is (9)
I believe the answer is:
courtroom
'where bench is' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'royal gathering fell back' is the wordplay.
'royal gathering' becomes 'court' (court is a kind of gathering. I am not sure about the 'royal' bit.).
'fell' becomes 'moor' (both can mean an expanse of wild land).
'back' shows that the letters should be reversed in order.
'moor' back-to-front is 'room'.
'court'+'room'='COURTROOM'
Can you help me to learn more?
(Other definitions for courtroom that I've seen before include "trial venue" , "trying situation" .)