Nice time for casual workers! (5)
I believe the answer is:
temps
This clue is a double definition.
'nice time' is the first definition.
('time' in French - eg in Nice)
'casual workers' is the second definition.
(temporary workers)
'for' acts as a link.
(Other definitions for temps that I've seen before include "perhaps seasonal?" , "We come and go" , "Nice weather" .)