Crossword Genius

Spike or Jimmy, perhaps (4)

Ross

I believe the answer is:

nail

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

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for nail that I've seen before include "thing for keeping things together" , "Measure of cloth" , "Perfectly execute" , "Spike, tack" , "Spike, fasten" .)

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