Eager to wail over the dead (4)
I believe the answer is:
keen
'eager' is the definition.
(I've seen this in another clue)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for keen that I've seen before include "Longing" , "Eager; wail in grief" , "Piercing" , "Fierce - sharp" , "Eager; dirge" .)