Bank staff, they cannot keep secrets? (7)
I believe the answer is:
tellers
'bank staff' is the definition.
(I've seen this in another clue)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for tellers that I've seen before include "Bank employees" , "who are recounting" , "Vote counters" , "Bank cashiers" .)