It serves ten items with a flourish (9)
I believe the answer is:
estaminet
'it' is the definition.
The definition suggests a singular noun which matches the answer.
'ten items with a flourish' is the wordplay.
'with' is a charade indicator (letters next to each other).
'flourish' indicates an anagram (I've seen 'flourished' mean this (I've seen this in other clues)).
'ten'+'items'+'a'='tenitemsa'
'tenitemsa' is an anagram of 'ESTAMINET'.
'serves' is the link.
Can you help me to learn more?
(Other definitions for estaminet that I've seen before include "bistro" , "eatery" , "provides food and drink" , "French restaurant" , "Neat items (anag) - small bar or cafe" .)