Have breakfast (3)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
eat
'have breakfast' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for eat that I've seen before include "Have 23d [MEAL]" , "Break bread" , "Worry" , "Bite, chew and swallow" , "Feed" .)