Crossword Genius

Hollow container by river (6)

Ross

I believe the answer is:

crater

'hollow' is the definition.
(thesaurus)

'container by river' is the wordplay.
'container' becomes 'crate' (crate is a kind of container).
'by river' becomes 'r' (I am not sure about the 'by' bit.**).
'crate'+'r'='CRATER'

(Other definitions for crater that I've seen before include "Great hole as on top of volcano" , "Hole formed by impact or explosion" , "Geological depression" , "Bowl-shaped cavity, in a volcano say" , "Bowl-shaped cavity as on volcano peak" .)

I've seen this clue in The Guardian.
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