Gypsies and queens’ peculiar style (10)
I believe the answer is:
Here is my best explanation:
'style' is the definition.
'gypsies and queens peculiar' is the subsidiary indication.
'gypsies' becomes 'roma'.
'and' says to put letters next to each other.
'peculiar' indicates an anagram.
'queens' anagrammed gives 'nesque'.
(Another definition for romanesque that I've seen is "(In architecture) Norman".)