Joan —, comedienne who voiced the character Dot Matrix in 1987 film comedy Spaceballs (6)

I believe the answer is:

rivers

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

I've seen this clue in The Mirror.

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