I completed this quite quickly yesterday morning and have a full grid with the correct seventh word. However I am left with a couple of unresolved issues.
I have not solved the 4th thematic clue which I assumes goes with 1a. I have the commoner association which is a 10 letter word sxxxxxxxxh and the only alternative I can find with 8 is txxxxxxe which I cannot parse from the clue.
Also I cannot find the extra word to go with 4d.