I need only two letters to finish this. There could be a misprint in the definition.
32 A. A tangle rector found in back of neglected border (6)
d?ed?e
'Dredge' would have R, rector, D from the end of 'neglected' and Edge, border - but I don't see how it fits the rest of the clue.
The only other word to fit seems to be Diedre, a rock angle/corner.