Upset worker in bathroom? Fired again (5)
I believe the answer is:
relit
'fired again' is the definition.
(I've seen this before)
'upset worker in bathroom?' is the wordplay.
'upset' shows that the letters should be reversed in order.
'worker in bathroom?' becomes 'tiler' (a tiler might tile a bathroom).
'tiler' reversed gives 'RELIT'.
(Other definitions for relit that I've seen before include "Again fired" , "Tiler (anag.)" , "Illuminated again" , "in flames again" , "got going again" .)