Perhaps needing plates inserted, without force (9)
I believe the answer is:
toothless
I believe this clue is a double definition.
'perhaps needing plates inserted' is the first definition.
(a plate is a part of a set of dentures)
'without force' is the second definition.
(Other definitions for toothless that I've seen before include "Lacking in force" , "Unable to chew; ineffective (sanction)" , "Lacking power" , "Deprived of power" .)