Pressing need (4)
'pressing need?' is the definition.
(you might need an iron to press clothes)
This is the entire clue.
(Other definitions for iron that I've seen before include "medicinal preparation for the anaemic?" , "Smooth - press - club" , "Metallic element, symbol Fe" , "sports club" , "great strength" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">pressing need</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for urgency that I've seen before include "Pressing importance requiring speedy action" , "Pressure" , "Need for prompt action" , "Immediate importance" , "Haste" .)