Crossword Genius

Chicken withdrew $1000 from bank ATM perhaps (6)

Ross

I believe the answer is:

bantam

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

'chicken' is the definition.
(I know that Bantam is a type of chicken)

'withdrew $1000 from bank atm perhaps' is the wordplay.
I cannot really understand how this works, but
an anagram of 'atm' is 'tam' which is present in the answer.
The remaining letters 'ban' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for bantam that I've seen before include "Little clucker" , "aggressive little sort" , "Dwarf variety of domestic fowl" , "Supplier of eggs" , "Aggressive person" .)

I've seen this clue in the Sydney Morning Herald.
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