Feature of bridge that needs care shown with maximum speed lowered (7)

I believe the answer is:

auction

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

'feature of bridge' is the definition.
'auction' can be an answer for 'bridge' (auction bridge is a kind of bridge). I'm not sure about the 'feature of' bit.

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

Can you help me to learn more?

(Other definitions for auction that I've seen before include "Public sale by bid" , "Competitive sale" , "Public bidding sale" , "Lots are sold here!" , "Public sale with lots" .)

I've seen this clue in The Times.

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