Cruncher, the verb in 30E is perfectly sound if you read it as a past participle, not just past tense.
I agree with tristram37 that the definition in 31 doesn't really conform to Chambers or to common usage.
Once again, I'm out of step with everyone else on this forum. I thought the clues mostly very uninteresting, and a puzzle consisting of 60% four-letter words and an average word length of 4.5 (well below the 5.5 minimum advised by the editors in their notes for setters) doesn't have much appeal for me. I realize that the theme and manner of its execution has imposed constraints (such as the need for a fair number of easy clues because of the multiple clashes) but if interesting words and witty clues are sacrificed, then a major delight in the tough cryptic has been lost.
I also found the two main stages of the endgame somewhat tedious, though I know that some solvers delight in that sort of thing. I was never a great fan of Sabre's 'Author', though the endgame there was admittedly far more tedious.