Summer's away (6)

I believe the answer is:

totter

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'summer's' is the definition.
(someone who does sums or tots things up)

I don't understand the rest of the clue.

(Other definitions for totter that I've seen before include "Stagger, reel" , "I add" , "Rag-and-bone man - summer" , "Walk unsteadily as if about to collapse" , "Move unsteadily; be about to fall" .)

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

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