Crossword Genius

Half of Mark's gamble (4)

Ross

I believe the answer is:

risk

'gamble' is the definition.
(I know that gamble can be written as risk)

'half of mark's' is the wordplay.
'half of' indicates taking half.
'mark' becomes 'asterisk' (asterisking is a kind of marking).
'asterisk' cut in half is 'RISK'.

(Other definitions for risk that I've seen before include "The possibility of danger - chance it" , "Danger or hazard" , "Possibility of bad outcome" , "Take a chance" , "Expose to danger" .)

I've seen this clue in The Telegraph.
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