Sweet number introducing refined piece (6)
I believe the answer is:
nougat
'sweet number introducing refined piece' is the definition.
I can't judge whether this definition defines the answer.
'sweet number introducing refined piece' is the wordplay.
'sweet number' becomes 'no' (abbreviation for 'number'. I am not sure about the 'sweet' bit.).
'introducing' says to put letters next to each other (some letters go before others).
'refined' becomes 'u' (abbreviation for upper-class - opposite to non-U).
'piece' becomes 'gat' (both can mean a gun).
'no'+'u'+'gat'='NOUGAT'
Can you help me to learn more?
(Other definitions for nougat that I've seen before include "Sweet made from honey, nuts, sugar, etc" , "Chewy nutty sweet" , "Chewy confection with nuts, cherries" , "Chewy confection with nuts, fruit, etc" , "Honey/nuts sweet" .)