Support half of those people with force (5)
I believe the answer is:
teeth
'force' is the definition.
(I've seen this before)
'support half of those people' is the wordplay.
'support' becomes 'tee' (I've seen this before).
'half of' indicates taking half.
'those people' becomes 'they' (I've seen this before).
'they' with half the letters taken is 'th'.
'tee'+'th'='TEETH'
'with' acts as a link.
(Other definitions for teeth that I've seen before include "Incisors, say" , "They may be given crowns" , "Eye, back, baby, gold or false, for example" , "Eg, canines, incisors" , "Canines, molars, etc" .)