Lockjaw (7)
I believe the answer is:
tetanus
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">lockjaw</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that lockjaw can be written as tetanus)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for tetanus that I've seen before include "Infection from wound" , "Disease causing muscular spasms" , "infectious disease" , "Attunes (anag) - muscular illness" , "Infection of the central nervous system" .)