Votes completely screened by machines (7)

I believe the answer is:

ballots

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'votes' is the definition.
('ballot' can be a synonym of 'vote')

'completely screened by machines' is the wordplay.
'completely' becomes 'all' (synonyms).
'screened by' is an insertion indicator.
'machines' becomes 'bots' (I can't explain this - if you can you should believe this answer much more).
'all' inserted inside 'bots' is 'BALLOTS'.

Can you help me to learn more?

I've seen this clue in The Guardian.

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