Revitalize (7)
I believe the answer is:
freshen
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">revitalize</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for freshen that I've seen before include "Make less stale" , "Re-invigorate" , "Grow stronger (wind)" , "(Wind) get stronger" , "(Of wind) become stronger and colder" .)