Kitchen item, jug, at back of empty sink (6)
I believe the answer is:
skewer
'kitchen item' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'jug at back of empty sink' is the wordplay.
'jug' becomes 'ewer' (type of vessel).
'at back of' means one lot of letters go next to another.
'empty' suggests removing the centre.
'sink' with its middle taken out is 'sk'.
'ewer' put after 'sk' is 'SKEWER'.
Can you help me to learn more?
(Other definitions for skewer that I've seen before include "Meat-pin" , "Metal spit" , "Metal stick (that's more awry?)" , "Criticise pointedly" , "Pin for food" .)