Crossword Genius

Made haste, but with some lack of speed! (4)

Ross

I believe the answer is:

sped

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'made haste' is the definition.
(I've seen this in another clue)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for sped that I've seen before include "Moved quickly" , "Hastened" , "Travelled quickly" , "was 8 [FLEET]" , "Moved fast" .)

I've seen this clue in the Evening Standard.
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