In jug, were reformed (4)

I believe the answer is:

ewer

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'in jug' is the definition.
'ewer' can be an answer for 'jug' (thesaurus). I am not sure about the 'in' bit.

'were reformed' is the wordplay.
'reformed' is an anagram indicator.
'were' anagrammed gives 'EWER'.

Can you help me to learn more?

(Other definitions for ewer that I've seen before include "Open vessel with handle and spout" , "A wide-mouthed water-jug" , "from which liquid may be poured" , "Large water-jug" , "Big jug" .)

I've seen this clue in the Evening Standard.

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