Crossword puzzle clue "paul's longest letter"

Paul's longest letter

Longest reptile in the longest river?

Last letter in most plurals (but not in this puzzle's six longest answers, which are the only plurals in this grid)

Number of times the letter 'U' appears in each of this puzzle's eight longest answers

Nonsense talk, whose circled letter is the start of what might be done with items in the four longest puzzle answers

Angle irons graphically represented by four sets of black squares in this grid, and by letter formations starting in the four longest answers

Letter that begins and ends this puzzle's six longest answers

Three-letter combinations hidden in this puzzle's six other longest answers