Crossword Genius

Has complete understanding, with hindsight? (5,9)

Ross

I believe the answer is:

knows backwards

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

'complete understanding with hindsight?' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'has' is the wordplay.
I cannot really understand how this works, but
'has' could be 'knows' ('know' can be a synonym of 'have') and 'knows' is present in the answer.
The remaining letters 'backwards' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

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I've seen this clue in The Times.
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