Opts for sound movies (5)
I believe the answer is:
picks
'opts for' is the definition.
(I've seen this in another clue)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for picks that I've seen before include "tools for breaking up rock" , "Chooses - tools for breaking rocks" , "Goes for" , "More than one tool" , "Choices" .)