Number of related things coming one after another (6)

I believe the answer is:

series

'number of related things coming one after another' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for series that I've seen before include "Similar things happening one after another" , "Set of TV programmes" , "Number of similar things arranged in order" , "Number of similar things occurring in order" , "See 8" .)

I've seen this clue in The Irish Times and the Irish Times (Simplex).

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