Crossword Genius

Informant at bank (6)

Ross

I believe the answer is:

teller

I'm a little stuck... Click here to teach me more about this clue!

This might be a double definition.

'informant' is the first definition.
(thesaurus)

'bank' is the second definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'at' is the link.

Can you help me to learn more?

(Other definitions for teller that I've seen before include "Bank official or narrator" , "Bank cashier or narrator of story" , "Narrator and bank clerk" , "Election official" , "One who instructs" .)

I've seen this clue in The Mirror.
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