That’s what we’re talking about, children (5)

I believe the answer is:

issue

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'children' is the definition.
(thesaurus)

I cannot understand how the rest of the clue works.

(Other definitions for issue that I've seen before include "Number (of periodical)" , "outlet" , "Point in dispute" , "Problem < children" , "Bring out - children" .)

I've seen this clue in the Evening Standard.

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