Pool or lake (4)

I believe the answer is:

mere

This clue is a double definition.

'pool' is the first definition.
(mere can mean a lake)

'lake' is the second definition.
(I know that mere is a type of lake)

(Other definitions for mere that I've seen before include "Nothing more than a small pool" , "Previously pure" , "Nothing more than a small pond" , "Lake in Cumbria" , "Lake; simple" .)

I've seen this clue in The Sun, The Times and The Telegraph.

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