Multi-generational novel where gold's discovered at end? (3,7)
I believe the answer is:
the rainbow
This clue is a double definition.
'multi-generational novel' is the first definition.
(D. H. Lawrence novel from 1915)
'where gold's discovered at end?' is the second definition.
(mythical pot of gold at end of rainbow)
(Other definitions for the rainbow that I've seen before include "Lawrence wrote" , "D. H. Lawrence novel" .)