Keep a cash supply, saving time for one who doesn't like spending (10)
I believe the answer is:
cheapskate
'one who doesn't like spending' is the definition.
(a cheapskate doesn't like to spend money)
'keep a cash supply saving time' is the wordplay.
'supply' indicates anagramming the letters (in a supple way).
'saving' is an insertion indicator.
'time' becomes 't' (abbreviation).
'keep'+'a'+'cash'='keepacash'
'keepacash' with letters rearranged gives 'cheapskae'.
'cheapskae' placed around 't' is 'CHEAPSKATE'.
'for' is the link.
(Other definitions for cheapskate that I've seen before include "Miserly type" , "Tightwad" , "ungenerous person" , "he won't pay the going rate" , "Ungenerous type" .)