Arrives at a base horizontally (6)

I believe the answer is:

slides

(Other definitions for slides that I've seen before include "Pieces of glass for study of specimens" , "Sloping chutes in the playground" , "Slips, slithers" , "Sloping chutes in playgrounds" , "Pieces of glass under the microscope" .)

I've seen this clue in the Newsday.

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