Crossword Genius

King splits trousers? They're in all across solutions here (6)

Ross

I believe the answer is:

rivers

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'king splits' is the definition.
The definition and answer can be both natural objects as well as being plural nouns.
Perhaps they are linked in a way I don't understand?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for rivers that I've seen before include "Large natural streams of water" , "Thames and Hudson?" , "''Only Our ... Run Free'' (MacConnell ballad)" , "Comedienne Joan" , "''Only Our ... Run Free'' (McConnell ballad)" .)

I've seen this clue in The Guardian.
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