I have mostly solved it.
I have only 3 clashes but have poet's name and the first line of poem marked in the grid.
I need help with:
The clues may have an extra letter to be removed.
3d. Damon blandly sinks Nuclear Ship: that’s extremely stupid! (5) O from Damon extra.
8d. Opening pen box? (6) I think p in pen is extra.
26a. Views Morag’s tax returns (6) Don't know if there is an extra letter.
3d dense ...d clashes
26a this is the one where you have to black out the letter... Scottish tax = stent ...reverse it ..."E" is missing for the answer tenets