Not entirely factual; that's true (6)

I believe the answer is:

actual

'true' is the definition.
(similar in meaning)

'not entirely factual that's' is the wordplay.
'not entirely' indicates a hidden word.
'ACTUAL' can be found hidden inside 'factual that'.

(Other definitions for actual that I've seen before include "Real, not illusory" , "Really existing" , "Real, existing in fact" , "Real and current (6)" , "De facto" .)

I've seen this clue in The Globe and Mail.

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