Support majority of the force (5)
I believe the answer is:
teeth
'force' is the definition.
(eg something with force or effect 'has teeth')
'support majority of the' is the wordplay.
'support' becomes 'tee' (tee is a kind of support).
'majority of' means to remove the last letter.
'the' with its final letter taken off is 'th'.
'tee'+'th'='TEETH'
(Other definitions for teeth that I've seen before include "Eg, canines, incisors" , "Structures in the jaws" , "They're to be found on a gear-wheel" , "enforcement mechanisms" , "Canines, for example" .)