Crossword Genius

Tough to figure out (4)

Ross

I believe the answer is:

hard

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

This is all the clue.

(Other definitions for hard that I've seen before include "Firm; demanding; stern" , "Tough - difficult" , "Solid, firm, rigid" , "Solid; tough" , "impenetrable" .)

I've seen this clue in the Newsday.
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