Royal advocate of baby sharing? (7)

I believe the answer is:

solomon

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This could be a double definition.

'royal advocate' is the first definition.
The definition suggests a singular noun which matches the answer.

'baby sharing?' is the second definition.
The definition suggests a singular noun which matches the answer.

'of' is the link.

Can you help me to learn more?

(Other definitions for solomon that I've seen before include "King of Israel with great wisdom" , "OT king" , "wise guy" , "Son of King David" , "Biblical wise king" .)

I've seen this clue in the Evening Standard.

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