Sorry I didn't think about that!
6a Country art required by PA (6, 6) the third letter of the first word is an O and the fifth of the first is an I, the third of the second it also an I
7a Wasn't sure what a little girl contributed (7) the third is an S and the fifth is an A
9a Top School's head is the last to arrive at the pitch (4) the third letter is an N.
15a The principle carnival for a small band (4) the second letter is an R
20a God of the First Reich may have been black (7) the first letter is a P and the fifth is an H.
13d Scattered the seed and got hot under the collar (7) the fourth letter is a T
They are the only ones so far with any helpful letters!