Trailer about another case (7)

I believe the answer is:

retrial

I'm a little stuck... Click here to teach me more about this clue!

'another case' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe you can see a link between them that I can't see?

'trailer about' is the wordplay.
'about' indicates anagramming the letters.
'trailer' with letters rearranged gives 'RETRIAL'.

Can you help me to learn more?

(Other definitions for retrial that I've seen before include "Second court hearing" , "Further action" , "Revived case" , "test, after failure in first" , "Hearing repeat" .)

I've seen this clue in The Daily Express.

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.