Teaching grad hit: it's chaos (6)
I believe the answer is:
bedlam
'chaos' is the definition.
(synonyms)
'teaching grad hit' is the wordplay.
'teaching grad' becomes 'bed' (I can't justify this - if you can you should give a lot more credence to this answer).
'hit' becomes 'lam' (to 'lam' means to hit hard).
'bed'+'lam'='BEDLAM'
'it's' is the link.
Can you help me to learn more?
(Other definitions for bedlam that I've seen before include "Blamed for a lot of noise" , "Blamed for 9 across? (8)" , "Scene of uproar and confusion" , "Very noisy confused place" , "Ambled (anag)" .)