Prone to tears, student ruined scary home (10)
I believe the answer is:
lachrymose
'prone to tears' is the definition.
'student ruined scary home' is the wordplay.
'student' becomes 'l' (as in L-plates for learner drivers).
'ruined' indicates anagramming the letters.
'scary'+'home'='scaryhome'
'scaryhome' is an anagram of 'achrymose'.
'l'+'achrymose'='LACHRYMOSE'
(Other definitions for lachrymose that I've seen before include "Weepy" , "showing sorrow" , "In bits" , "Sad" , "Tearful (literary)" .)