Somewhat obsolete, went out (5)
I believe the answer is:
dated
This could be a double definition.
'somewhat obsolete' is the first definition.
'dated' can be an answer for 'obsolete' (I've seen this before). I'm not sure about the 'somewhat' bit.
'went out' is the second definition.
(dating is a kind of going out)
Can you help me to learn more?
(Other definitions for dated that I've seen before include "Walked out with" , "Outmoded" , "Met socially by arrangement" , "Old-fashioned" , "Old fashioned" .)