Set a live trap in your attic. We do this with coons in the barn.
You can then release outside or do what you want with it.
If its a squirrel you should not have any trouble getting it...not sure what to use in the trap for bate though...coons like grape jelly or sardines!
Karen L

Yes, use the live trap. Havaheart, I think is a brand name. Get the correct size trap. CAll the Extension Service in your are and ask what to bait it with, although you can try peanut butter. I squirrel that frequents out back porch raids the grill after wee cook steaks, so lard may be a favorite too.

AND fix the hole after you trap and remove the animal. My mother had a mouse problem and caught them and reased them out the front door, only to have them return and kept seeing the same mouse in the trap on consecutive trappings, even market it with a felt tip pen to verify.

--Nate