ADDRESS is another of those words that compilers love for its ambiguity: as a verb, you can address a problem, an envelope or the nation, and as a noun it can be a SPEECH, what you CALL SOMEONE/HOW YOU GREET them, or WHERE YOU LIVE. ONLINE ADDRESS or WEB ADDRESS, meanwhile, is URL
Fun and educational as always, thanks again! 5A and 3D were the most challenging for me. (Eventually got both from the wordplay and/or some help — in this case, from OneLook. I'd never heard of 3D before but it makes sense; while I had heard of marmosets, though I forgot that as monkeys they were also primates, 5A (without the "t") was a totally new one to me.)
TBH, I'd never heard of 5 across and 3 down - I included them with liberal help from Google when nothing else fitted, But one of the joys of crosswords for me is that I can often work out the answer, even when it's a word I've never heard of (this happens to me a great deal with the online crossword in the British Independent, which is my favourite crossword. The setters clearly have a much larger vocabulary than me, as does one of my crossword club, who gets most of the words I don't know)