“In that case a freed slave”, one interposed (6)
I believe the answer is:
valise
'in that case a freed' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'slave one interposed' is the wordplay.
I cannot really see how this works, but
'one' could be 'i' (Roman numeral) and 'i' is located in the answer.
an anagram of 'slave' is 'valse' which is located in the remaining letters.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for valise that I've seen before include "Overnight case" , "Small piece of luggage" , "Small overnight bag" , "Small travelling bag or suitcase" , "Travel bag" .)