Crossword Genius

It's not that ancient history is incomplete (4)

Ross

I believe the answer is:

this

'it's not that' is the definition.
(this one as opposed to that one)

'ancient history is incomplete' is the wordplay.
'is incomplete' indicates a hidden word (an incomplete sample of the clue).
'THIS' can be found hidden inside 'ancient history'.

(Other definitions for this that I've seen before include "The thing here referred to" , "One particular" , "The thing under discussion" , "What's here" , "near thing" .)

I've seen this clue in the Evening Standard.
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