Crossword Genius

Let deep changes use everything up (7)

Ross

I believe the answer is:

deplete

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

'use everything up' is the definition.
I can't tell whether this definition defines the answer.

'let deep changes' is the wordplay.
'changes' indicates anagramming the letters.
'let'+'deep'='letdeep'
'letdeep' with letters rearranged gives 'DEPLETE'.

Can you help me to learn more?

(Other definitions for deplete that I've seen before include "Empty, reduce, exhaust" , "Reduce (amount of supplies etc)" , "Use up, reduce in quantity" , "Reduce the quantity of (resources)" , "Drain" .)

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