Cursed having spilt the salt in bed (7)
I believe the answer is:
blasted
'cursed' is the definition.
(similar in meaning)
'spilt the salt in bed' is the wordplay.
'spilt' is an anagram indicator.
'in' indicates putting letters inside.
'salt' with letters rearranged gives 'last'.
'last' going into 'bed' is 'BLASTED'.
'having' acts as a link.
(Other definitions for blasted that I've seen before include "Flipping" , "Like the heath in Macbeth" , "Damned" , "Blown up" , "darned" .)