Hacks writer's forum for academic achievements (10)

I believe the answer is:

columnists

I'm a little stuck... Click here to teach me more about this clue!

'hacks writer's' is the definition.
'columnist's' can be an answer for 'writer's' (columnist is a kind of writer). I'm unsure of the 'hacks' bit.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for columnists that I've seen is " pressmen revealed".)

I've seen this clue in the Irish Times.

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