In the interim (9)
'in the interim' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for meanwhile that I've seen before include "In the interim" , "On the other hand" , "simultaneously" , "For the moment" , "In the intervening time" .)
(Other definitions for meantime that I've seen before include "Intervening period" , "For the moment" , "interval" , "interim?" .)