Crossword Genius

A popular Christmas present for children in the 1940s (4)

Ross

I believe the answer is:

lego

(Other definitions for lego that I've seen before include "Building bricks for children" , "Toy construction set" , "Toy building-bricks" , "Kids' bricks" , "Toy building blocks" .)

I've seen this clue in The Sunday Times and The Times.
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