Here are the possible solutions for floor between first and second clue
Answer
Clue
Relevancy
mezzanine
Clue
Floor between first and second
Floor between floors
Definition
a low storey between two main storeys of a building, generally between the ground floor and the first floor
stair
Clue
One going from floor to floor
stairs
Clue
Between Basement and Main Floor.
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
Definition
to act playfully
luka
Clue
Suzanne Vega song with the lyric "I live on the second floor"