Synth, at least on that laptop, is a very SLOW build. It has been running here now for at least two hours, and no end in sight.
Ha! I've got an old 8GB, Quad Core AMD64 with spinning disks as a poudriere package builder for my Armv7/8 stuff and some packages take a week to build because of all the damn dependencies. Ok, it's cross-compiling, but still, you don't know what SLOW is...
OK. Will do...as soon as it is finished installing synth
If the port builds successfully, don't worry about the make clean. It was just an idea before you ran your build in case there's some guff in the port's working directory.