2 down
Watch
money
deposited
in
bank
(5)
Watch money deposited in bank (5)
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The definition is at the beginning of the clue.
How the clue works
The definition is Watch — think of a timer as a device for measuring time. Now for the wordplay: M (abbreviation for money) is deposited inside TIER (bank, as in a row or layer), slotting the M in to give TI-M-ER.