Money mart turned out to be short-lived (9)
I believe the answer is:
momentary
'be short-lived' is the definition.
(I've seen this before)
'money mart turned out' is the wordplay.
'turned out' indicates an anagram (turn out can mean to organise).
'money'+'mart'='moneymart'
'moneymart' is an anagram of 'MOMENTARY'.
'to' acts as a link.
(Other definitions for momentary that I've seen before include "Brief" , "Short-lived" , "Lasting only a short time" , "Fleeting" .)