Up to no good

Fancy caterpillar
Creeping along
Trying to be unobtrusive
On the clematis
But failed.
Up to no good
But I didn't have the heart
To remove him.

Finished off a piece of work this morning, then potted on some seedlings. Planned to finish planting my big border but the rain dictated otherwise. So another garden blip ... No idea what it is, maybe a fellow blipper can tell me.