Felt off
I believe the answer is:
ailed
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">felt off</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 ailed that I've seen before include "was on the blink?" , "Delia (anag.)" , "Felt bad" , "Troubled" , "Didn't feel well" .)