I’m sure it will, aristophanes, but in case it doesn’t, for 5a the unaltered answer reads as the three dissimilar letters from the last two words of the clue. Quite neat.
21a is just the second (mentioned), minus its last letter.
I didn’t mind the US-centric 27a at all. It’s general knowledge, and the (London) Times has enough cricket references to restore the balance. Crosswords should reflect their origin, in my view.