Here are the possible solutions for first opening clue
Answer
Clue
Relevancy
actone
Clue
Opening at an opening
keyhole
Clue
Opening for opening
Definition
a hole for a key
longo
Clue
Opening opening?
peephole
Clue
Opening used before opening a door
Definition
a small opening through which one may look
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
proto
Clue
First opening?
Definition
(tradename) as in proto team, a team of people trained to deal with underground rescues, etc.
ringcycle
Clue
Musical work in four parts, with its first part opening the Met's 2010-11 season
