“Squandered” has a sad sound to it (4)
I believe the answer is:
blew
'squandered' is the definition.
('blow' can be a synonym of 'squander')
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for blew that I've seen before include "Tooted" , "Squander in the past" , "Gusted" , "Sounded (a whistle)" , "Bungled (an opportunity)" .)