Learn German: Bezüglich der neuen Klausel wird der Anwalt Sie kontaktieren. - Regarding the new clause, the lawyer will contact you.

The preposition bezüglich requires the genitive case. Because Klausel is a feminine noun, its definite article changes from die to der in the genitive. The adjective neu gets the -en ending, which is the standard ending for adjectives following a definite article in the genitive case.

Could I use hinsichtlich in this sentence instead?

Yes, you could say Hinsichtlich der neuen Klausel... and the meaning would be exactly the same. Both bezüglich and hinsichtlich are formal prepositions that take the genitive and mean "regarding" or "with respect to." They are highly interchangeable in business and legal contexts.

Since der is also the dative feminine article, how do we know this is genitive?

You are right that the feminine article der can be either dative or genitive! However, we know this is genitive because the preposition bezüglich strictly dictates the genitive case in standard German. If you swapped in a masculine noun, the genitive would be visually obvious: Bezüglich des neuen Vertrags (Regarding the new contract). In casual spoken German, you might hear native speakers use the dative with these prepositions, but in formal writing, you should always stick to the genitive.

Why is the verb wird placed before the subject der Anwalt?