Slump to which there is a story (4)
I believe the answer is:
saga
'story' is the definition.
(a saga is a long story)
'slump to which there is a' is the wordplay.
I cannot really understand how this works, but
'slump' could be 'sag' (I've seen this in another clue) and 'sag' is located in the answer.
'a' is found in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for saga that I've seen before include "Heroic narrative" , "Medieval Icelandic legend" , "A long adventurous story - it's a gas" , "Epic tale" , "Norse epic" .)