Quiet hush at the end of the day (3)
I believe the answer is:
shy
'quiet' is the definition.
Both the definition and answer are adjectives. Perhaps there's an association between them I don't understand?
'hush at the end of the day' is the wordplay.
'hush' becomes 'sh'.
'at the end of' suggests the final letters.
The last letter of 'day' is 'y'.
'sh'+'y'='SHY'
Can you help me to learn more?
(Other definitions for shy that I've seen before include "Recoil" , "Reserved" , "cast" , "Embarrassed in company" , "'Lacking self-confidence, timid (3)'" .)