Totter before the fall? (6)

I believe the answer is:

summer

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'totter' is the definition.
(someone who tots up or does sums)

I cannot understand how the rest of the clue works.

(Other definitions for summer that I've seen before include "Adder" , "See 10" , "'Oh, the ...time is comin', and the leaves are sweetly bloomin'' (song)" , "Late singer" , "Would one count" .)

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

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