Work hard to contain university room disarray (7)
I believe the answer is:
turmoil
'disarray' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'work hard to contain university room' is the wordplay.
'work hard' becomes 'toil' (to toil is to do strenuous work).
'to contain' indicates putting letters inside.
'university' becomes 'U' (abbreviation for university).
'room' becomes 'rm' (abbreviation for room).
'u'+'rm'='urm'
'toil' placed around 'urm' is 'TURMOIL'.
Can you help me to learn more?
(Other definitions for turmoil that I've seen before include "Pandemonium" , "Unrest - upheaval" , "Disquiet" , "Hubbub" , "agitating activity" .)