Reduce speed (4)

I think it could be either:

Which length description are you looking for?:

4,2

slow

'reduce speed' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for slow that I've seen before include "Dull-witted - late" , "lacking any precipitation" , "Not getting a move on" , "Moving at low speed" , "Dilatory" .)

I've seen this clue in The Telegraph, the Newsday, The Guardian, the Wall Street Journal, the Universal, the Canadiana, The Times, the L.A. Times Daily and The Washington Post.

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