I'm just not seeing it. For 13a I'm guessing it's (p)rater but, if so, is it the E or R that is the extra letter.
Also, for 'g?tre' I've used an O and an I but I haven't got an I from the extra letters?
In the second column. the unclued word crosses with the two long central ones so I've only got ??P?I? and for the central words I've got N?CTL?PI and ?ER?PHTHLM? which, even if I add in the AA or BB gives me nothing. As for the unclued in the last column, I've got ER???? because I don't know , if RATER is correct, if the E or R goes in. - I'm losing the will to live:-(