Know (7)
I believe the answer is:
realise
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">know</span>' is the definition.<br/ ><span class="explanation-format__explanation">('know'->'realize' is in my internal thesaurus and 'ize'->'ise')</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for realise that I've seen before include "Accept as fact or bring in as profit" , "Discover" , "Achieve, make" , "See the light" , "Come to be aware" .)