An aqueduct, perhaps, to shorten (7)

I believe the answer is:

abridge

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

'shorten' is the definition.
(synonyms)

I can't explain the remainder of the clue.

(Other definitions for abridge that I've seen before include "Shorten, a book say, without losing the sense" , "Make short work" , "Make shorter, book say" , "Condense, summarise" , "Reduce the length of" .)

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.