Bank in danger, it turned out (8)
I believe the answer is:
gradient
'bank' is the definition.
(thesaurus)
'danger it turned out' is the wordplay.
'turned out' indicates an anagram.
'danger'+'it'='dangerit'
'dangerit' is an anagram of 'GRADIENT'.
'in' acts as a link.
(Other definitions for gradient that I've seen before include "Degree of slope in a road" , "Treading (anag) - slope" , "Bank" , "Slope or incline" , "Rise" .)