The people who count in banking (7)

I believe the answer is:

tellers

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'the people' is the definition.
(teller is a kind of person)

'count in banking' is the wordplay.
'count' becomes 'tell' (I've seen this before).
'in banking' becomes 'ers' (I am not sure about this - if you are sure you should believe this answer much more).
'tell'+'ers'='TELLERS'

'who' acts as a link.

Can you help me to learn more?

(Other definitions for tellers that I've seen before include "Vote counters" , "Bank cashiers" , "Bank employees" , "who are recounting" .)

I've seen this clue in The Globe and Mail.

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