1/10 across
Out-of-this-world
23
coming
together,
system
rapidly
forming
(9,6)
Out-of-this-world 23 coming together, system rapidly forming (9,6)
hints
0
checks
0
hints
The definition is at the end of the clue.
How the clue works
The definition is system rapidly forming, referring to a galaxy with a high rate of star formation. STARBURST and GALAXY are both brands of candy (the answer to 23 down), and their names are literally "Out-of-this-world" — so the two come together to give STARBURST GALAXY.