Mom's mom (4)
I believe the answer is:
gran
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">mom's mom</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for gran that I've seen before include "Senior family member" , "... Canaria in the Atlantic Ocean" , "old lady" , "... Canaria, island off African coast" , "Mum's mum" .)