Large number missing introduction in storyline (3)
I believe the answer is:
lot
'large number' is the definition.
(a large amount)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for lot that I've seen before include "Large amount; Abraham's nephew" , "Where filming may take place" , "Portion in life" , "Great deal; French river" , "Fate - great number" .)