Bold vigorous and exuberant old queen coming in naked (7)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

O (abbreviation for old) + QU (abbreviation for queen) inserted into BARE (naked). For once, “old queen” isn’t ER and “naked” doesn’t mean dropping the first and last letters of something. Descriptive of a particular style in art and architecture.