Incorrect amount ruefully deposited (6)

I believe the answer is:

untrue

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

'incorrect' is the definition.
(I've seen this before)

'amount ruefully deposited' is the wordplay.
'UNTRUE' is hidden within the letters.
However, I am unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for untrue that I've seen before include "Not accurate or veracious" , "Fallacious" , "Spurious" , "disloyal" , "Incorrect or false" .)

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

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