Keen on (4)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">keen on</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for into that I've seen before include "Four this twelve is three" , "Teachers' trade union" , "Keen on, colloquially" , "A fan of" , "Showing enthusiasm for" .)
(Other definitions for fond that I've seen before include "Affectionate - tender" , "Partial to" , "Feeling affection, maybe foolish" , "Affectionate, maybe foolish" , "Keen on; indulgent" .)