Crossword Genius

Case closed, tidied up, without a second being amalgamated (9)

Ross

I believe the answer is:

coalesced

'being amalgamated' is the definition.
('coalesced' can be a synonym of 'amalgamated')

I cannot understand how the remainder of the clue works.

(Other definitions for coalesced that I've seen before include "Came together as one" , "Mixed" .)

I've seen this clue in The Independent.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.