Join up (5)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">join up</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for enrol that I've seen before include "Join up, sign on" , "Recruit" , "Add to list of members" , "Register (as member)" , "Register officially" .)
(Another definition for optin that I've seen is " Decide to take part".)
(Other definitions for connect that I've seen before include "Bring together" , "Join - link" , "Link together" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">join up</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 enlist that I've seen before include "Join the military" , "Join up - tinsel (anag)" , "Obtain help of" , "Take the Queen's shilling" , "Listen (anag.)" .)