Most withdrawn cash - yesterday’s deposit (6)

I believe the answer is:

shyest

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

'most withdrawn' is the definition.
(I've seen this in another clue)

'cash yesterday's deposit' is the wordplay.
'SHYEST' is hidden within the letters.
But, I am not sure how this is indicated.

Can you help me to learn more?

(Other definitions for shyest that I've seen before include "withdrawn the most" , "Most retiring" , "Most timid" , "shrinking the most?" , "Most diffident" .)

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

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