Currently a money dispenser? (1,1,1)

I believe the answer is:

a t m

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

'dispenser?' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'currently a money' is the wordplay.
'currently' becomes 'at' (I can't explain this - if you can you should give a lot more credence to this answer).
'a money' becomes 'm' (abbreviation in economics).
'at'+'m'='A T M'

Can you help me to learn more?

I've seen this clue in The Mirror.

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