11D Tina's famous wedding location (4) ?a?a.
I'm pretty sure it's CANA but cannot see why.
22 A. Composer called an unfortunate, lacking ancestry (6) o?p?a?
Again, it must be ORPHAN but cannot see the wordplay.
Finally, one I can't answer.
19D. Nonsense writer, first name shortened with 25 (7) ?e?r?e?
25 = ERUDITION
Hope they're not too obvious.