Cow kicking dead relative (4)

I believe the answer is:
aunt
'relative' is the definition.
(aunt is a type of relative)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for aunt that I've seen before include "Parent's sister" , "Parent's female sibling" , "Charley's in play?" , "kinswoman" , "Tuna (anag.)" .)
