Flame @ 48, for 12a the last word is the definition (of a sort) the word play breaks down as the figure, first two word, then second two words. The “intruder” is obvious. For 28a the first word is the definition and the word play is the third word as amended by the test of the clue after it.
Ilipu, sounds like you have the right answer but your S,T and O crossers are wrong. You need to find a different position for the relocated letter in each of those down answers.