It's the least one can do (7)

I believe the answer is:

minimum

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'it's the least' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

(Other definitions for minimum that I've seen before include "Lowest value" , "Bottom" , "Lower limit" , "Least possible quantity" , "Least recorded value" .)

I've seen this clue in The Globe and Mail.

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