Hamster's home (4)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hamster's home</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 cage that I've seen before include "Nicolas - - (films)" , "he used to write down scores" , "Structure of bars or wire" , "Coop" , "Prison for 21" .)