Family tree member
'family tree member' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for aunt that I've seen before include "Uncle's wife" , "Female relation" , "Wife of one's uncle" , "Parent's sister" , "Tuna gone bad for the relative" .)
(Other definitions for uncle that I've seen before include "takes the pledge" , "Male relative - pawnbroker" , "Grandfather's son" , ". . . . . Sam, the US government" , "one who's taken the pledge" .)