Crossword Genius

Grass found at the bank! (6)

Ross

I believe the answer is:

teller

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

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for teller that I've seen before include "Edward ---, physicist; vote-counter" , "Counter of votes or a bank employee" , "One who instructs" , "One records cash" , "one reckons" .)

I've seen this clue in The Irish Independent.
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