Crossword Genius

Light-headed person's name for a game (5)

Ross

I believe the answer is:

lotto

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'game' is the definition.
(the UK National Lottery)

'light-headed person's name' is the wordplay.
'light headed person's' becomes 'l' (I can't explain this - if you can you should believe this answer much more).
'name' becomes 'otto' (Otto is an example).
'l'+'otto'='LOTTO'

'for a' acts as a link.

Can you help me to learn more?

(Other definitions for lotto that I've seen before include "Bingo - Venetian painter" , "Children's game; lottery" , "Children's game similar to bingo" , "Bingo-like game" , "Game of chance similar to bingo" .)

I've seen this clue in the Evening Standard.
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