Bank jargon (4)
I believe the answer is:
cant
I believe this clue is a double definition.
'bank' is the first definition.
(synonyms)
'jargon' is the second definition.
(synonyms)
(Other definitions for cant that I've seen before include "Hypocritical speech" , "lean over" , "Insincerity" , "Stock phrases made nonsensical by endless repetition" , "Hypocritical talk sounding negative" .)