Hello Devadolly,
A tad on the difficult side today, to say the least! I have taken a leap of faith with regard to the size of the initial solution grid, the otherwise unused letter which is used to augment the existing entries, and found some of the redundant words, that correspond to the augmented entries. Have now started to enter words into the grid, this will hopefully asist with solving more clues. Am nowhere near deducing the unclued three word entry, although I have the first word! Now going to take a rest and resume tomorrow! A large Glenmorangie may well relax my poor brain, it certainly will not inspire it!
Do I hear you say, "come back Mr O, all is forgiven"?