Crossword Genius

Frequently decimal? (5)

Ross

I believe the answer is:

often

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'frequently' is the definition.
(synonyms)

I cannot understand how the rest of the clue works.

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(Other definitions for often that I've seen before include "Frequently, many times" , "Frequently, habitually" , "A lot" , "Multiply" , "Commonly" .)

I've seen this clue in The Sun, The Globe and Mail, The Irish News and The Irish Independent.
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