I do a CPA clone I like and It is simple..
7litre boil..
2kg coopers dry malt extract.
.5 kg dex
100g crystal steeped 30 min.
10g POR @60 10%AA
10g any hop @10 min (I like Golden cluster)
You can leave out the 10min addition if you like.
You can add more POR at 60min to if you leave out the 10min addition.
Some will say this is not bitter enough but I find it quite nice.
Note use coopers dry malt as it seems to give the best result.
Drinking this one (cluster) now and loving it..
Cheers
Edit 700g malt and steepings in the boil. and US-05 yeast.