Crossword Genius

Car being introduced earlier, not very unsafe? (10)

Ross

I believe the answer is:

precarious

'unsafe?' is the definition.
(similar in meaning)

I cannot understand how the rest of the clue works.

(Other definitions for precarious that I've seen before include "Not having a steady position" , "Hairy" , "Uncertain; likely to fall" , "having difficulty remaining upright" , "Highly insecure" .)

I've seen this clue in The Guardian.
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