He's in business in the Rialto (6)

I believe the answer is:

tailor

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'he's' is the definition.

'business in the rialto' is the wordplay.
'rialto' can be anagrammed to 'TAILOR'.
But, I am not sure how the anagram is indicated.

'in' is the link.

Can you help me to learn more?

(Other definitions for tailor that I've seen before include "One who makes garments" , "Specially adapt" , "fitter" , "Garment maker" , "Maker of clothes for men" .)

I've seen this clue in the Evening Standard.

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