Possible Clues:

• It's not the beast that's 2 down
• Truth, for Keats; She walks in it, Byron
• See 12
• It's nice to see the depth of this in 10 across
• Quality found in the eye of the beholder?
• Supremely pleasing quality
• Lovely to be said to be only 2 down with what's beastly
• ` `. . . . . . is only skin-deep' '
• Buy tea blended for excellence in looks
• Attractive quality