Done & submitted, but I’m still puzzled by 1 across. In an effort to see which category it belonged to, I tried to match each clue/solution with the categories in the preamble. However, it states that there are 4 instances where the theme is inserted spuriously into the clue in full. But I make that 5:-
14a garden I
15a grain
22a string
2d barging
18d Tring
So I’m still none the wiser. Can anyone help?