Put oneself forward (9)
I believe the answer is:
volunteer
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">put oneself forward</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 volunteer that I've seen before include "One works in an unpaid capacity" , "tender service" , "One enlisting of own free will" , "Without being asked" , "person working for free, perhaps" .)