This one started off so quickly for me, but I've ground to a halt on the last 2/3. 21d and 23a, not helped by the fact I can't determine the tense of my answer to 16d.
I've had trouble in this southern part in any case, as I started off with an equally appropriate phrase fitting the 'truth' of 22a, now corrected.
So any help with 23 would be appreciated.
Or if not, does the definition incl 2 or 3 words at the end of 21d. I have a word that fits, but it messes 23. (or at least the quick solve can't find it.)