He can't lose! (6)

I believe the answer is:

victor

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'he can't lose' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'he can't' is the wordplay.
'he' becomes 'Vic' (short for Victor).
'can't' becomes 'tor' (I can't justify this - if you can you should believe this answer much more).
'vic'+'tor'='VICTOR'

Can you help me to learn more?

(Other definitions for victor that I've seen before include "Competitor who's first" , "Meat; complain" , "The one who wins the battle" , "whiskey after this" , "''To the . . . . . . the spoils'' (6)" .)

I've seen this clue in the Evening Standard.

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