Answer: I believe it would be definition 1
I apologize in advance if it’s wrong I can’t see the text clearly, but I hope it helps to some extent!
Answer:
They (Scout, Jem, and Dill) play like they are Boo Radley.
Explanation:
Scout was Mrs. Radley, Dill was old Mr. Radley and Jem was Boo, lashing out at them.
The effect of the simile in this passage makes the passage more interesting and gives it that extra "boost" to help the reader understand what is going on.
Hope this helps!