After the first couple of scenes, trip awkwardly over lines (6)
I believe the answer is:
script
'lines' is the definition.
(I've seen this in another clue)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for script that I've seen before include "Performance text" , "Form of writing" , "Printed text" , "Handwriting, play text" , "Hand" .)