Here are the possible solutions for first to second for one clue
Answer
Clue
Relevancy
abigail
Clue
First name of the second first lady
Definition
(archaic) a lady's maid
abet
Clue
Second a second-story man
Definition
to incite by encouragement and support
pps
Clue
Second second thought, for short
basepath
Clue
First to second, for one
Definition
a baserunner's path between bases
fun
Clue
First word across in the first-ever crossword (1913) and the first of a dozen appearances of the word in this puzzle's grid, written word search-style (left, right, down, and diagonally) ... Can you f