Crossword Genius

King captured one sure to fail (5)

Ross

I believe the answer is:

goner

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

'sure to fail' is the definition.
I can't judge whether this defines the answer.

'king captured one' is the wordplay.
'king' becomes 'GR' (short for Georgius Rex, King George in Latin).
'captured' is an insertion indicator.
'gr' enclosing 'one' is 'GONER'.

Can you help me to learn more?

(Other definitions for goner that I've seen before include "One doomed to die" , "No-hoper" , "dying man" , "Someone as good as dead" , "One dead or beyond hope of recovery" .)

I've seen this clue in the Sydney Morning Herald.
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