Crossword Genius

Deep — essential (5)

Ross

I believe the answer is:

inner

I believe this is a double definition.

'deep' is the first definition.
(I've seen this before)

'essential' is the second definition.
(thesaurus)

(Other definitions for inner that I've seen before include "Opposite of 13" , "Private, not expressed" , "Internal - mental" , "This sort of man will be satisfied!" , "Part of an archery target" .)

I've seen this clue in The Guardian.
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