Hollow, depression (11)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
indentation
I believe this clue is a double definition.
'hollow' is the first definition.
(thesaurus)
'depression' is the second definition.
(synonyms)
(Other definitions for indentation that I've seen before include "Deep recess or notch" , "depression" .)
I've seen this clue in The Times.
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