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' indicates named letters should be taken away.
'disastrous' is an anagram indicator.
'great'+'number'='greatnumber'
'greatnumber' with 'at' taken out is 'grenumber'.
'grenumber' with letters rearranged gives '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" .)