Could someone oblige with a description of Zorba Hold?

Amalgamation is Samba, and precede is Whisk to L (with L to R hold) turning to face LOD, releasing L to R hold and taking Zorba Hold.
Is this man's LH on (top?) of lady's R shoulder, and lady's RF on (top?) of man's L shoulder? I assume that as previous hold was man's palm upwards, with lady's palm downwards, that lady's arm lies on top of the man's in the new hold, and that the arms are more-or-less straight (ie that man and lady are both facing LOD at arms length.

Or have I got that wrong?

Zorba hold is a hold that applies to a side-by-side position. Mans LH and lady's RH are unjoined. The mand R arm is on the lady's shoulder and vice versa, in both cases palms down. The conjoined arms will be slightly bent at the elbow such that the mans R arm is on top of the lady's from his elbow outwards but the remainder of his arm will be underneath. There are other variants as well where the mans L hand stays lower down on the lady's back. Anything goes really. I'm not sure why you think the man's palm should be upwards though.