Crossword puzzle clue "circled letter often"

Circled letter, often

[Circled letter]-consuming activity

What the circled letter in this answer represents, homophonically

Elliptical (Circled Letter Group C)

With the circled letter over, self-ruled entity

Thanksgiving dish (Circled Letter Group D)

Fountain-pen part (Circled Letter Group B)

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