Encouraging boost (6)
I believe the answer is:
fillip
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">encouraging boost</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 fillip that I've seen before include "lift" , "Encouraging boost" , "Encouragement, stimulus" , "If pill could be used as a stimulant" , "Spur - incentive" .)