Long-legged bird of British waterways (5)

I believe the answer is:

heron

(Other definitions for heron that I've seen before include "Large British wading bird" , "Rhone (anag) - bird" , "Long-legged long-necked wading bird" , "Wader" , "Bird of the Rhone, strangely" .)

I've seen this clue in The Times.

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