Crossword Genius

Tough to solve (4)

Ross

I believe the answer is:

hard

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">tough to solve</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(Other definitions for hard that I've seen before include "Firm, rigid, road leading to foreshore" , "impenetrable" , "Tough - difficult" , "badly" , "Newspaper's sure" .)

I've seen this clue in the Sydney Morning Herald.
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