Tory sabre rattling in upmarket diner (6,3)
I believe the answer is:
oyster bar
'upmarket diner' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
'tory sabre rattling' is the wordplay.
'rattling' is an anagram indicator (letters rattle around).
'tory'+'sabre'='torysabre'
'torysabre' with letters rearranged gives 'OYSTER BAR'.
'in' is the link.
Can you help me to learn more?
(Another definition for oyster bar that I've seen is " eatery".)