Create a Shader that is a mask (texture) using world position WITHOUT tiling

Development Asset Creation
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Hello there ! I would need help in order to create a shader that is using world position but that doesnt make a texture (mask) tiling. I would like to be able to change the tile and offset of the texture but… definitely without having the mask tiling ! Any idea ?
Thanks in advance !!
PS 1 : Basically is being able to have a movable round mask in the red area
PS 2 : I need to use it as a light material in order to have the cloud texture panning all over a specific area (:

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Edit :
Got it, I didn’t know there was a clamp parameter in the texture sampler node

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Click on the texture node, then find Sampler Source property and choose Shared: Clamp