Wasteful (8)
I believe the answer is:
prodigal
'wasteful' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for prodigal that I've seen before include "Grip load (anag.)" , "This son got the fatted calf" , "Recklessly wasteful or extravagant" , "Wasting money" , "overspending" .)