Where people read of marriage not working (3)
I believe the answer is:
uni
'where people read' is the definition.
The definition suggests a singular noun which matches the answer.
'marriage not working' is the wordplay.
'marriage' becomes 'union' (synonyms).
'not' is a deletion indicator.
'working' becomes 'on' (e.g. a machine is working or on).
'union' with 'on' removed is 'UNI'.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for uni that I've seen before include "Short for university" , "University (abbreviation)" , "educational establishment" , "Place of higher education (abbr)" , "Queen's, Belfast, for example" .)