The aim of equal education? (7,5)
I believe the answer is:
evening class
'the aim' is the definition.
Both the definition and answer are singular nouns.
Maybe they are linked in a way I don't understand?
'equal education?' is the wordplay.
'equal' becomes 'evening' (I can't explain this - if you can you should give a lot more credence to this answer).
'education?' becomes 'class' (class is a kind of education).
'evening'+'class'='EVENING CLASS'
'of' is the link.
Can you help me to learn more?
(Other definitions for evening class that I've seen before include "Teaching session after teatime" , "After-work education" .)