Skin-deep (7)

I think it could be either:

Which length description are you looking for?:

shallow

'skin-deep' is the definition.
(thesaurus)

This is all the clue.

(Other definitions for shallow that I've seen before include "Insincere" , "Superficial" , "Having little depth" , "justice" , "Of no great depth" .)

I've seen this clue in the Sydney Morning Herald.

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