Crossword Genius

Secures sluggish individual cycling (5)

Ross

I believe the answer is:

nails

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

I don't understand how the rest of the clue works.

(Other definitions for nails that I've seen before include "Horny plates and pointed pins" , "Slain with metal pins" , "measure of hardness?" , "Metal spikes" , "Tacks - arrests" .)

I've seen this clue in The Independent.
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