Fix hose (4)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fix hose</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for darn that I've seen before include "Mend by stitching - damn!" , "Sew" , "Blow" , "Repair by sewing, socks perhaps" , "Mend with 17s - mild expletive" .)