Crossword Genius

They may have to be driven home (5)

Ross

I believe the answer is:

nails

I'm a little stuck... Click here to teach me more about this clue!

'they' is the definition.
Both the definition and answer are plural nouns.
Maybe there's an association between them I don't understand?

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

Can you help me to learn more?

(Other definitions for nails that I've seen before include "Fastens with spikes" , "Metal fasteners" , "Cock's crest" , "Fixing spikes" , "Slain with metal pins" .)

I've seen this clue in The Globe and Mail.
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