Sixth sense (3)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sixth sense</span>' is the definition.<br/ ><span class="explanation-format__explanation">(extra-sensory perception)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for esp that I've seen before include "Second sight (abbr)" , "Apparent power to perceive things that others can't, in short" , "Apparent power to perceive things that others can't, initially" , "Extrasensory perception (abbrev.)" , "Initially, clairvoyance or telepathy" .)
(Another definition for gut instinct that I've seen is " First intuition".)