Half of crew jeer this vessel (4)

I believe the answer is:

ewer

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'vessel' is the definition.
(ewer is a type of jug)

'half of crew jeer' is the wordplay.
'half of' indicates taking half.
'jeer' becomes 'er' (I am not sure about this - if you are sure you should believe this answer much more).
'crew' cut in half is 'ew'.
'ew'+'er'='EWER'

'this' is the link.

Can you help me to learn more?

(Other definitions for ewer that I've seen before include "Water-jar" , "A wide-lipped jug" , "Large water jug" , "Container" , "Jug with wide spout" .)

I've seen this clue in The Irish Times.

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