Memorised (6)
I believe the answer is:
learnt
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">memorised</span>' is the definition.<br/ ><span class="explanation-format__explanation">(to memorise is to learn by heart)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for learnt that I've seen before include "Gained knowledge of rental" , "Acquired by instruction" , "informed" , "Found out" , "Committed to memory" .)