Strong restless desire (4)
(Other definitions for itch that I've seen before include "Restless longing" , "following seven years in union?" , "Nagging wish" , "burn" , "Tingle" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">strong restless desire</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 urge that I've seen before include "Plead" , "Constrain" , "Advise strongly to press forward" , "Press to take action" , "Persuade - proclivity" .)