Crossword Genius

Beauty but skin deep (6)

Ross

I believe the answer is:

veneer

I'm a little stuck... Click here to teach me more about this clue!

'skin deep' is the definition.
'veneer' can be an answer for 'skin' (thesaurus). I'm not sure about the 'deep' bit.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for veneer that I've seen before include "Thin wooden covering" , "Thin layer of a fine material on the surface" , "Superficial coating" , "Superficial shine" , "Thin decorative covering of fine wood" .)

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