A spider possibly saved Bruce from it (7)
I believe the answer is:
despair
'bruce from it' is the definition.
I can't tell whether this defines the answer.
'a spider possibly saved' is the wordplay.
'possibly' indicates anagramming the letters.
'saved' is an insertion indicator (save can mean to keep hold of).
'spider' anagrammed gives 'despir'.
'a' placed inside 'despir' is 'DESPAIR'.
Can you help me to learn more?
(Other definitions for despair that I've seen before include "Hopeless" , "Feeling of hopelessness" , "Smashed up" , "Lose or lack hope" , "Give up hope" .)