How could an empty gallery be unaffected? (7)
I believe the answer is:
artless
'unaffected?' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for artless that I've seen before include "Natural - uncontrived" , "Simple and natural in manner" , "Natural like slaters" , "Ingenuous" , "Without pretension" .)