Pitcher found in drain, not small (4)

I believe the answer is:

ewer

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'pitcher' is the definition.
('ewer' can be a synonym of 'pitcher')

I don't understand how the rest of the clue works.

(Other definitions for ewer that I've seen before include "A wide-lipped jug" , "Sort of jug" , "Oversized jug" , "Open vessel with handle and spout" , "Jar for water" .)

I've seen this clue in The Telegraph.

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