Opted to switch bank (5)
I believe the answer is:
depot
'bank' is the definition.
(thesaurus)
'opted to switch' is the wordplay.
'to switch' indicates an anagram.
'opted' is an anagram of 'DEPOT'.
(Other definitions for depot that I've seen before include "Terminus for transport vehicles" , "bus terminus" , "Headquarters - storehouse" , "Storehouse or warehouse" , "(Military) store" .)