Keeper missed start in bad experience (5)
I believe the answer is:
owner
'keeper' is the definition.
(I've seen this in another clue)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for owner that I've seen before include "Title-holder" , "Person with legal title to something" , "Title holder?" , "One that secured" , "One who has something" .)