Great number missing at disastrous rallies here (9)
I believe the answer is:
nuremberg
'rallies here' is the definition.
The answer is a location as well as being a singular noun. This is suggested by the definition.
'great number missing at disastrous' is the wordplay.
'missing' suggests deleting specific letters.
'disastrous' is an anagram indicator.
'great'+'number'='greatnumber'
'greatnumber' with 'at' taken away is 'grenumber'.
'grenumber' is an anagram of 'NUREMBERG'.
Can you help me to learn more?
(Other definitions for nuremberg that I've seen before include "German town of trials fame" , "Here war criminals tried" , "City of Wagner's Meistersingers" , "Bavarian city" , "German city of Nazi war trials" .)