Easy terms can initially mean there's more to come (3,2,2)

I believe the answer is:

and so on

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'easy' is the definition.
Both the answer and definition are adverbs. Perhaps they are linked in a way I don't understand?

I can't explain the remainder of the clue.

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(Other definitions for and so on that I've seen before include "I say no more" , "Etc - in English and in full" , "Continuing in the same way" , "Etc. (3.2.2)" , "Et cetera" .)

I've seen this clue in The Irish Times.

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