Random dirty hack affected everybody (3,4,3,5)

I believe the answer is:

tom dick and harry

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

'everybody' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'random dirty hack affected' is the wordplay.
'affected' is an anagram indicator.
'random'+'dirty'+'hack'='randomdirtyhack'
'randomdirtyhack' with letters rearranged gives 'TOM DICK AND HARRY'.

Can you help me to learn more?

(Other definitions for tom dick and harry that I've seen before include "Being basic geezer" , "Anyone" , "Ordinary people" .)

I've seen this clue in The Guardian.

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