Horrid gentleman saving bank (5)
I believe the answer is:
ridge
'bank' is the definition.
'horrid gentleman saving' is the wordplay.
'saving' says the answer is hidden in the clue.
'RIDGE' can be found hidden inside 'horrid gentleman'.
(Other definitions for ridge that I've seen before include "Raised line of ice" , "Line of higher ground" , "Line of raised ground" , "Crest - spine" , "Bump between furrows" .)