Seamstress beheaded in jug? (4)
I believe the answer is:
ewer
'jug?' is the definition.
(type of vessel)
'seamstress beheaded' is the wordplay.
'seamstress' becomes 'sewer' (someone who sews).
'beheaded' means to remove the first letter (the head of the word is removed).
'sewer' with its first letter removed is 'EWER'.
'in' acts as a link.
(Other definitions for ewer that I've seen before include "Large, wide-mouthed jug" , "Were (anag)" , "Container" , "Big jug" , "Sort of jug" .)