Enroll, with "in" (3)
I believe the answer is:
opt
(Other definitions for opt that I've seen before include "End or act of shutting" , "Choose from pot" , "Plump for" , "Prefer, choose" , "Make a choice" .)
I believe the answer is:
opt
(Other definitions for opt that I've seen before include "End or act of shutting" , "Choose from pot" , "Plump for" , "Prefer, choose" , "Make a choice" .)