Aunt's husband (5)
I believe the answer is:
uncle
'aunt's husband' is the definition.
(your aunt's husband would be your uncle)
This is the entire clue.
(Other definitions for uncle that I've seen before include "For example, Tom Cobbleigh" , "Brother of one's parent" , "One receiving pawn" , "Pawnbroker's nickname" , "Male family member" .)