As played by a light-headed German? (5)
I believe the answer is:
lotto
'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" .)