Flower from Mr Alexander-Arnold? (5)

I believe the answer is:

trent

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'flower' is the definition.
(River Trent)

I don't understand how the rest of the clue works.

(Other definitions for trent that I've seen before include "Nottingham's river" , "Crossword frame" , "River at Stoke and Burton" , "running water" , "Major English river" .)

I've seen this clue in The Sun.

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