Show that's unselected, might one say out loud? (6)
I believe the answer is:
depict
'show' is the definition.
(to depict is to show or portray)
'unselected might one say out loud?' is the wordplay.
'unselected might one say' becomes 'depicked' (not picked or selected).
'out loud?' indicates a 'sounds like' (homophone) clue (I've seen 'out loud' mean this).
'depicked' is a homophone of 'DEPICT'.
'that's' acts as a link.
(Other definitions for depict that I've seen before include "Make portrait" , "Show by drawing" , "Show in form of picture, or describe in words" , "'Show, portray (6)'" , "Sketch or describe" .)