Revolutionary platform (9)
I believe the answer is:
turntable
This might be a double definition.
'revolutionary' is the first definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
'platform' is the second definition.
(I know that turntable is a type of platform)
Can you help me to learn more?
(Other definitions for turntable that I've seen before include "Revolving platform" , "Old record-holder" , "Rotating platform" , "LP support" , "Record spinner" .)