Worry when leader of race goes missing (3)
I believe the answer is:
eat
'worry' is the definition.
(something worrying may eat someone up)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for eat that I've seen before include "Break bread" , "Gobble up" , "Scoff" , "Devour" , "Bit, chew and swallow" .)