Crossword Genius

Change regular pattern of succession with any number dropping out (10)

Ross

I believe the answer is:

alteration

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'change' is the definition.
(I know that change can be written as alteration)

I don't understand the remainder of the clue.

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(Other definitions for alteration that I've seen before include "Adjustment" , "Change" , "Amendment" .)

I've seen this clue in The Telegraph.
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