Making a clipping path on all white background stock art

[Dongkyjizz]

I just bought some clip art with a white background and I was hoping it would be super easy to select the image (without the white background) and drop it in to my collage. I thought the photo would come with a cutout but that doesn't appear to be the case. Is there an easy way to select those small details on the branches?

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[firstdefence]

1. Select the trunk using the Selection brush 
2. Invert the selection: Select > Invert Pixel Selection
3. Use: Filter > Colour >Erase White Paper.

If you don't isolate the trunk it will become translucent against a coloured background.

I got a bit carried away lol!