Online contributors to press organisation (7)

I believe the answer is:

posters

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'online contributors' is the definition.
Although both the answer and definition are plural nouns, I don't understand how they can define each other.

'to press organisation' is the wordplay.
'organisation' indicates an anagram.
'to'+'press'='topress'
'topress' anagrammed gives 'POSTERS'.

Can you help me to learn more?

(Other definitions for posters that I've seen before include "Placards, notices" , "Contributors to forum" , "Bills or placards on walls" , "Public placards" .)

I've seen this clue in the Sydney Morning Herald.

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