We are doing the same thing, and, like you, have managed without special instructions until number 10! we found a reference to them mentioned in a later puzzle:
"the 28 solutions are divided into four groups of seven, each member of the group beginning with the same letter. all 28 definitions are normal and positioned with the correct clue number, but the cryptic parts of the clues have been swapped around. the cryptic part for any definition will always be found in a clue whose solution begins with the same letter, though these ignore the initial letter of the solution."
Good luck!