As one in the fountain pen hobby, I wholly agree with the surface of 4a4AThere aren't nibs enough in the world to content a writer (5)[-----]
I think 1d1DStray - it's mine (5)[-----] and 3d3DPerhaps Nixon and Trump are jerks (5)[-----] are perhaps too cute by half... I felt 1d1DStray - it's mine (5)[-----] should have included something like "you might catch mine" or some such... and why those people for 3d3DPerhaps Nixon and Trump are jerks (5)[-----]? Just the social commentary?
Anyway thx for another great puzzle