Crippling (7)
I believe the answer is:
ruinous
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">crippling</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ruinous that I've seen before include "Causing destruction" , "Exorbitant" , "causing harm?" , "Catastrophic" , "Destructive and causing downfall" .)