Beans cooked, toast ultimately missing (6)
I believe the answer is:
'missing' is the definition.
(similar in meaning)
'beans cooked toast ultimately' is the wordplay.
'cooked' indicates anagramming the letters.
'ultimately' indicates one should take the final letters.
The last letter of 'toast' is 't'.
'beans' anagrammed gives 'absen'.
(Other definitions for absent that I've seen before include "lack of attention", "Not present - vacuous", "Not where one should be", "Missing, lacking", "miles away".)