Abstained from food (6)
I believe the answer is:
fasted
'abstained from food' is the definition.
('fast' can be a synonym of 'abstain from food')
This is all the clue.
(Other definitions for fasted that I've seen before include "Abstained from food for a period" , "Didn't eat" , "Ate no food" , "Went without food for a period" , "Abstained from food as in penance" .)