Crossword Genius

Landform which is the remains of a sub-glacial stream bed (5)

Ross

I believe the answer is:

esker

(Other definitions for esker that I've seen before include "gravelly deposit" , "Sediment" , "Glacial ridge" , "bar, perhaps" , "Gravel ridge; reeks (anag.)" .)

I've seen this clue in The Times and The Sunday Times.
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