Exe and Wye, say (but not Zed) (6)

I believe the answer is:

rivers

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

I've seen this clue in The Guardian.

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