Architect of ultimate in homes currently on London’s east side (7)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

A charade of S (‘ultimate in home S ‘) plus NOW (‘currently’) plus DON (‘Lon DON ‘s east side’). The definition must refer to the First Earl of Snowdon, Antony Armstrong-Jones, and is definitely misleading. According to Wikipedia , he codesigned the London Zoo aviary, known as the Snowdon Aviary (now Monkey Valley), and of which he was particularly proud. Of course it fits the crossword’s theme.