Crossword Genius

Dim ... thick ... astonishing! Nah, undo travesty of this ... (4,6,6,10)

Ross

I believe the answer is:

iain duncan smiths knighthood

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

'dim thick astonishing nah undo travesty' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'of this' is the wordplay.
I cannot really see how this works, but
'of' could be 'o' and 'o' is found in the answer.
an anagram of 'this' is 'iths' which is located in the answer.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Independent.
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