Crossword Genius

It's star-studded party given by two unknowns (6)

Ross

I believe the answer is:

galaxy

'it's star-studded' is the definition.

'party given by two unknowns' is the wordplay.
'two unknowns' means two replacements for 'unknown'.
'party' becomes 'gala' (I've seen this before**).
'given' means one lot of letters go next to another.
'by' says to put letters next to each other.
'unknown' becomes 'x' (algebra).
'unknown' becomes 'y' (algebra).
'gala'+'x'+'y'='GALAXY'

(Other definitions for galaxy that I've seen before include "The Milky Way, for example" , "Assemblage of stars" , "Huge collection of stars" , "many stars" , "e.g. The Milky Way" .)

I've seen this clue in The Telegraph.
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