Soap bars perhaps made from best tallow? Not half (7)
I believe the answer is:
tablets
'soap bars perhaps' is the definition.
(a soap bar is a tablet of soap)
'from best tallow? not half' is the wordplay.
'from' indicates an anagram (from the letters).
'not half' indicates taking half.
'tallow' cut in half is 'tal'.
'best'+'tal'='besttal'
'besttal' with letters rearranged gives 'TABLETS'.
'made' acts as a link.
(Other definitions for tablets that I've seen before include "Battles (anag.)" , "Pills" , "Pellets of medicine" .)