I have a similar sounding issue, most noticeable when turning the steering to almost full lock. As Johntechx said, I think it is a worn top mount bearing. It is possible to have them replaced rather than replacing the whole strut. Lexus rather unhelpfully do not sell the bearings as a separate part however.
Creaking front o/side suspension when moving off or low speed manoeuvring.
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I have a similar sounding issue, most noticeable when turning the steering to almost full lock. As Johntechx said, I think it is a worn top mount bearing. It is possible to have them replaced rather than replacing the whole strut. Lexus rather unhelpfully do not sell the bearings as a separate part however.