Multigenerational tale (4)
I believe the answer is:
saga
'multigenerational tale' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for saga that I've seen before include "Epic tale" , "Long involved tale" , "Soap opera" , "A long story or poem - it's a gas" , "Icelandic or Norse story" .)