Crossword Genius

In the main, it provides the best way to stop (6)

Ross

I believe the answer is:

anchor

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

'stop' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see an association between them that I don't see?

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

Can you help me to learn more?

(Other definitions for anchor that I've seen before include "Member of relay team" , "Last runner in relay race team" , "Device used to prevent vessel from drifting" , "It prevents a vessel from moving" , "Source of stability" .)

I've seen this clue in The Irish Independent.
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