Darkest day, maybe, with client stories condemned (6,8)
I believe the answer is:
winter solstice
'darkest day' is the definition.
The answer and definition can be both related to time as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
'with client stories condemned' is the wordplay.
'with' becomes 'w' (short for with).
'condemned' indicates an anagram.
'client'+'stories'='clientstories'
'clientstories' is an anagram of 'intersolstice'.
'w'+'intersolstice'='WINTER SOLSTICE'
'maybe' is the link.
Can you help me to learn more?
(Other definitions for winter solstice that I've seen before include "Occasion of the shortest day" , "Time of shortest day" .)