Mouselike (6)
'mouselike' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for rodent that I've seen before include "Placental mammal having a single pair of incisor, 'gnawing', teeth" , "Mouse or squirrel, say" , "Eg, mouse, squirrel" , "Gnawing creature" , "Creature such as a rat" .)
(Other definitions for meek that I've seen before include "Patient and easily imposed upon" , "Deferential" , "Humble and mild" , "Patient and submissive" , "Mild and timid" .)