Crossword Genius

Unexpected twist in US version of Pound: king taking knight (6)

Ross

I believe the answer is:

kicker

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'unexpected twist in us version of pound' is the definition.
I can't tell whether this definition defines the answer.

'king taking knight' is the wordplay.
'king' becomes 'k'.
'taking knight' becomes 'icker' (I can't explain this - if you can you should give a lot more credence to this answer).
'k'+'icker'='KICKER'

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I've seen this clue in The Guardian.
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