Crossword Genius

Tough to crack (4)

Ross

I believe the answer is:

hard

'tough to crack' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for hard that I've seen before include "Newspaper's sure" , "Solid; tough" , "Strenuous" , "Novel featuring Mr Gradgrind" , "Difficult; severe" .)

I've seen this clue in The Wall Street Journal.
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