It gets noisier all the time (9)
I believe the answer is:
crescendo
This clue might be a double definition.
'it gets noisier all' is the first definition.
The definition suggests a singular noun which matches the answer.
'the time' is the second definition.
The definition and answer can be both human attributes as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
Can you help me to learn more?
(Other definitions for crescendo that I've seen before include "Gradual increase in loudness, musically" , "Peak of intensity" , "Gradually increasing sound" , "Gradual increase in music's loudness" , "Building up of sound" .)