Crossword Genius

An attractive bar, perhaps (6)

Ross

I believe the answer is:

magnet

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'bar perhaps' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

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

Can you help me to learn more?

(Other definitions for magnet that I've seen before include "drawer?" , "Source of attraction" , "Attractive item" , "Centre of attraction" , "Attractive type" .)

I've seen this clue in the Evening Standard.
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