One without faith or time during a robbery (7)
I believe the answer is:
atheist
'one without faith' is the definition.
(someone with no religious faith)
'time during a robbery' is the wordplay.
'time' becomes 't' (abbreviation).
'during' is an insertion indicator.
'robbery' becomes 'heist' (heist is a kind of robbery).
'a'+'heist'='aheist'
't' inserted inside 'aheist' is 'ATHEIST'.
'or' acts as a link.
(Other definitions for atheist that I've seen before include "I don't believe" , "One disbelieving in the existence of God or gods" , "Non-believer in god - hates it (anag)" , "Sceptic" , "One denies the existence of a god" .)