Throw quiet party in the end (3)
I believe the answer is:
shy
'throw' is the definition.
(I have seen 'Quick throw ' mean 'shy' so perhaps 'throw' could also mean 'shy')
'quiet party in the end' is the wordplay.
'quiet' becomes 'sh'.
'in the end' indicates one should take the final letters.
The final letter of 'party' is 'y'.
'sh'+'y'='SHY'
(Other definitions for shy that I've seen before include "cast" , "Bashful or timid" , "Timid (around people)" , "Suddenly start" , "Embarrassed in company" .)