Sat at length after this? (6)
I believe the answer is:
friday
This clue might be a double definition.
'sat' is the first definition.
The answer and definition can be both related to time as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'length after this?' is the second definition.
The definition suggests a singular noun which matches the answer.
'at' acts as a link.
Can you help me to learn more?
(Other definitions for friday that I've seen before include "Man perhaps" , "Crusoe's native" , "God is thanked for this" , "twenty-four hours" , "Crusoe's companion" .)