Crossword Genius

Is due to cracks in the superficies (7)

Ross

I believe the answer is:

outside

'the superficies' is the definition.
(thesaurus)

'is due to cracks' is the wordplay.
'cracks' indicates anagramming the letters (I've seen 'cracking' mean this).
'is'+'due'+'to'='isdueto'
'isdueto' is an anagram of 'OUTSIDE'.

'in' is the link.

(Other definitions for outside that I've seen before include "having emerged from the tunnel?" , "Where smokers now often must go" , "Alfresco" , "Without" , "External surface" .)

I've seen this clue in the Evening Standard.
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