6d - First 4 letters are "what you might get when boxed" then a single letter for "a little ethical" then a 4 letter "salad" - definition is a (scientific) "principle".
Can anyone help with the parsing of 5D, 12A and/or (especially) 16A? I'm no closer to working out what on earth is going on with any of them after staring at them for an hour.
Of course, having posted, I now see two of them (too much reading backwards needed this week imho!). But I still think 'odd' should be 'even' if 12A is to work properly. And how you arrive at the poet continues to elude me.