Inexperienced? Not with us getting hardened (7)
I believe the answer is:
callous
'hardened' is the definition.
('callous' can be a synonym of 'hardened')
'inexperienced? not with us' is the wordplay.
I cannot quite understand how this works, but
'us' is within the answer.
This may be the basis of clue (or it may be nonsense).
'getting' acts as a link.
Can you help me to learn more?
(Other definitions for callous that I've seen before include "Heartless" , "Hard-hearted" , "Not feeling" , "Emotionally hardened" , "Cruelly unfeeling" .)