Period of mourning for god (5)
I believe the answer is:
shiva
I believe this is a double definition.
'period of mourning' is the first definition.
(mourning period in Judaism)
'god' is the second definition.
(Shiva is a Hindu god)
'for' acts as a link.
(Other definitions for shiva that I've seen before include "God presiding over personal destinies" , "Major Hindu god with third eye in middle of forehead" , "Jewish period of mourning" , "Hindu god, the destroyer" , "Major Hindu deity (the destroyer)" .)