Well heleninglos I've put in an answer but suspect it may not be correct. I assume you have -i-e . So cannot help you with a correct answer as quite a few would work.
Hi GG,
The alliteration grid is a grid that Everyman uses when deploying alliteration rather than his more common rhyming pair as the gimmick. It generally comprises a two word phrase in the 1a position, each word starting with the same letter and split so that the first letter of the second word gives the first letter of the long down clue (here 4d) which links to the bottom row (here 25a). Each of the solutions in these three positions contain the same alliterative letter as their basis.
There are slight variations to the actual grids used but they generally all follow this principle.
I hope that makes sense!
Thanks for that, I was going to ask the same question. I must watch for it. Are there other grid types that determine a certain style. Or should I say trick of the trade!