Crossword puzzle clue "filler's letters"

Here are the possible solutions for filler's letters clue

Answer
Clue
Relevancy
dds
Clue
Filler's letters
Cavity-filler's letters
pulledpork
Clue
Messy sandwich filler ... or a hint to this puzzle's circled letters
apo
Clue
Letters on letters to GIs
Letters for soldiers' letters
Letters for enlistees' letters
Letters on letters to soldiers
Definition
(short for) apolipoprotein, a type of protein
attn
Clue
Letters on business letters

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