Small bricks drop, dumping tons (4)

I believe the answer is:

lego

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'small bricks' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for lego that I've seen before include "Building bricks for children" , "Toy building bricks" , "Toy consisting of interlocking plastic bricks" , "construction kit" , "Kids' bricks" .)

I've seen this clue in The Telegraph.

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