Leathery (5)
I believe the answer is:
tough
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">leathery</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for tough that I've seen before include "Resilient; thug" , "Strong - difficult" , "Rough, violent; strong" , "Difficult or leathery" , "Hardy and strong" .)