Classify space for instruction (9)
I believe the answer is:
classroom
'instruction' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'classify space' is the wordplay.
'classify' becomes 'class' (synonyms).
'space' becomes 'room' (room is a kind of space).
'class'+'room'='CLASSROOM'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for classroom that I've seen before include "School space" , "Where children learn" , "Lessons are learnt here" , "Teaching environment" , "Part of a school" .)