Williams may well be looked up to (5)

I believe the answer is:

venus

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

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for venus that I've seen before include "Solar system planet" , "Roman goddess of love" , "Next planet in" , "Morning star" , "Evening star" .)

I've seen this clue in the Evening Standard.

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