You shouldn't have wasted time over place settings (9)
I believe the answer is:
tableware
'place settings' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
'you shouldn't have wasted time over' is the wordplay.
'you shouldn't have' becomes 'ta' (both can mean 'thank you').
'wasted' becomes 'blew' (eg to blow money is to waste it).
'time' becomes 'era' (an era is a period of time).
'over' says the letters should be written in reverse.
'era' back-to-front is 'are'.
'ta'+'blew'+'are'='TABLEWARE'
Can you help me to learn more?
(Other definitions for tableware that I've seen before include "Dinner service" , "Bowls, for example" , "knives, etc" , "Crockery, cutlery, etc." .)