Here are the possible solutions for what the first and last letters of 13 answers in this puzzle proceed through clue
Answer
Clue
Relevancy
alphabet
Clue
What the first and last letters of 13 answers in this puzzle proceed through
Definition
a set of letters
eleven
Clue
How many letters are in the longest answers in this puzzle - or how many of these answers there are
Definition
a number, ten and one
asif
Clue
Valley girl's "yeah, right" [IMPORTANT: SEE THE 'NOTE' (above) for key info about this week's puzzle and SEE THE LAST CLUE DOWN for the explanation of last week's puzzle.]
newyear
Clue
An apt one is spelled out by combining the first two letters of nine Across answers in this puzzle