Wasted time, aimed to be prompt (9)
I believe the answer is:
immediate
'prompt' is the definition.
(I've seen this before)
'wasted time aimed' is the wordplay.
'wasted' indicates anagramming the letters.
'time'+'aimed'='timeaimed'
'timeaimed' is an anagram of 'IMMEDIATE'.
'to be' acts as a link.
(Other definitions for immediate that I've seen before include "Nearest" , "Prompt,straightaway" , "Direct" , "Occurring without delay" , "Involving no delay" .)