Crossword Genius

As played by a light-headed German? (5)

Ross

I believe the answer is:

lotto

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

'as played by a light-headed german?' is the definition.
I can't tell whether this defines the answer.

'by a light-headed german?' is the wordplay.
'by' means one lot of letters go next to another.
'a light-headed' becomes 'l' (this could be a standard abbreviation I've not previously seen).
'german?' becomes 'otto' (I've seen this before).
'l'+'otto' is 'LOTTO'.

Can you help me to learn more?

(Other definitions for lotto that I've seen before include "Bingo-like game" , "Children's game similar to bingo" , "gamble" , "Children's game, housey-housey" , "Housey-housey, bingo" .)

I've seen this clue in the Evening Standard.
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