Gallery slats (6)
I believe the answer is:
louvre
'gallery' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for louvre that I've seen before include "Mona Lisa here" , "European museum" , "Art exhibition" , "National art gallery of France, in Paris" , "Slatted ventilation - Paris museum" .)