Condiment in grave condition (7)
I believe the answer is:
vinegar
'condiment' is the definition.
(I know that vinegar is a type of condiment)
'in grave condition' is the wordplay.
'condition' indicates anagramming the letters (I've seen 'conditions' mean this (letters must be in a new condition)).
'in'+'grave'='ingrave'
'ingrave' with letters rearranged gives 'VINEGAR'.
(Other definitions for vinegar that I've seen before include "Soured wine, cider etc." , "Acidic condiment" , "Pickling medium" , "Healer with brown paper" , "Pickling fluid" .)