Concluded facts mostly were wrong (8)

I believe the answer is:

inferred

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'concluded' is the definition.
(inferring is a kind of concluding)

'facts mostly were wrong' is the wordplay.
'facts' becomes 'info' (I've seen this in another clue).
'mostly' means to remove the last letter.
'were wrong' becomes 'erred' (I can't explain this - if you can you should believe this answer much more).
'info' with its last letter taken off is 'inf'.
'inf'+'erred'='INFERRED'

Can you help me to learn more?

(Other definitions for inferred that I've seen before include "Deduced by reasoning" , "Rein Fred in because he deduced" , "Conjectured" , "'Concluded, judged from the facts (8)'" .)

I've seen this clue in The Times.

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