Changing room twenty-seven maybe contains one cold student (7)
I believe the answer is:
cubicle
'changing room' is the definition.
(I've seen this before)
'twenty-seven maybe contains one cold student' is the wordplay.
'twenty-seven maybe' becomes 'cube' (I can't explain this - if you can you should give a lot more credence to this answer).
'contains' indicates putting letters inside.
'one' becomes 'i' (Roman numeral).
'cold' becomes 'c' (eg on taps).
'student' becomes 'l' (as in L-plates for learner drivers).
'i'+'c'+'l'='icl'
'cube' going around 'icl' is 'CUBICLE'.
Can you help me to learn more?
(Other definitions for cubicle that I've seen before include "Enclosed section of room" , "bay" , "Partitioned-off part of room" , "Cell" , "Small, private compartment" .)