Online discussion site (5)

I believe the answer is:

forum

'online discussion site' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for forum that I've seen before include "Ancient Roman marketplace or place for public discussions" , "Online message board" , "Meeting of people for discussion" , "Place of assembly for the people in ancient Greece" , "Place for open discussion" .)

I've seen this clue in The Guardian.

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