Be a couch potato (8)
I believe the answer is:
vegetate
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">be a couch potato</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for vegetate that I've seen before include "Do very little" , "Live a dull inactive life" , "Lead a dull and inactive life" , "appears to be inert" , "Live uneventful life, stagnate" .)