Crossword Genius

How could an empty gallery be unaffected? (7)

Ross

I believe the answer is:

artless

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'unaffected?' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

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(Other definitions for artless that I've seen before include "Natural - uncontrived" , "Simple and natural in manner" , "Natural like slaters" , "Ingenuous" , "Without pretension" .)

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