Gallivant with a son of Jacob (3)
I believe the answer is:
gad
I believe this is a double definition.
'gallivant' is the first definition.
(I know that gallivant can be written as gad)
'son of jacob' is the second definition.
(I know that Gad father Jacob)
'with a' acts as a link.
(Other definitions for gad that I've seen before include "wander in search of pleasure" , "old Israelite territory" , "wandering about" , "Gallivant in search of pleasure" , "biblical tribe" .)