I saw a few Sour diesel seeds and there telling me it's a "clone" seeds? Does this mean it will yield less then a regular seed?
no it just means someone took a clone off of a sour diesel plant, budded it out and pollinated it for seeds. Its still sour diesel, yield only depends on grow techniques
imo, it refers to a 'selfed' or s1 seed. as in, they took the clone, and pollinated it with itself. this involves intersexing.