Setback in retirement (6)
I believe the answer is:
recess
This clue might be a double definition.
'setback' is the first definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'retirement' is the second definition.
(thesaurus)
'in' is the link.
Can you help me to learn more?
(Other definitions for recess that I've seen before include "break needed!" , "Small concavity" , "Nook for a break from business" , "State of abeyance or suspended business" , "(Political) holiday" .)