Fascinated, but about to get hurt (7)
I believe the answer is:
charmed
'fascinated' is the definition.
('charm' can be a synonym of 'fascinate')
'about to get hurt' is the wordplay.
'about to' becomes 'ced' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'get' means one lot of letters goes inside another.
'hurt' becomes 'harm' ('harm' can be a synonym of 'hurt').
'ced' enclosing 'harm' is 'CHARMED'.
'but' is the link.
Can you help me to learn more?
(Other definitions for charmed that I've seen before include "Entranced" , "blessed by fortune" , "Enchanted" , "Unusually lucky" .)