Not cracked - in fact, not harmed at all (9)
I believe the answer is:
untouched
'fact not harmed at all' is the definition.
I can't judge whether this defines the answer.
'not cracked' is the wordplay.
'not' becomes 'un' (prefix meaning 'not').
'cracked' becomes 'touched' (I am not sure about this - if you are sure you should believe this answer much more).
'un'+'touched'='UNTOUCHED'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for untouched that I've seen before include "left!" , "kept intact" , "Not handled" .)