Bewildered by bank's lobbyist (4)
I believe the answer is:
lost
'bewildered' is the definition.
(I know that bewildered can be written as lost)
'bank's lobbyist' is the wordplay.
'bank's' says to hollow out the word (remove centre letters) (I've seen 'banks of' mean this (the banks are the sides of the word)).
'lobbyist' with its middle taken out is 'LOST'.
'by' is the link.
(Other definitions for lost that I've seen before include "Mislaid or was defeated" , "Not having known where one is" , "Mislaid or strayed" , "Mislaid or irretrievable" , "Missing" .)