Don't save, but pass, one's time (5)
I believe the answer is:
spend
This might be a double definition.
'don't save' is the first definition.
(I've seen this in another clue)
'pass one's time' is the second definition.
'spend' can be an answer for 'pass' (synonyms). I'm unsure of the 'one's time' bit.
'but' is the link.
Can you help me to learn more?
(Other definitions for spend that I've seen before include "Blow" , "Lay out money" , "Pay out (money)" , "Pass (time) in a specified way" , "Use (money etc)" .)