- - Unaware
- - not tethered to reality
- - Delusional
- - Without a firm grip on reality
- - Somewhere else entirely
- - To ace Music Theory, don't wander off ....
- - Watching the Teletubbies?
- - Where one is when solving this puzzle?
- - Daydreaming.
- - Completely out of touch
- - Dreaming, say
- - Unrealistic
- - Out of touch with reality
- - Out to lunch
- - Spaced out
- - ... out of it!
- - See 21-Across
- - Checked out
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