Energy, informally

I believe the answer is:
oomph
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">energy informally</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for oomph that I've seen before include "Get-up-and-go" , "Go" , "Informal energy or enthusiasm, usually in a girl" , "Enthusiasm - vigour - sex appeal" , "sex-appeal" .)