Disinter old philosopher (6)
I believe the answer is:
exhume
'disinter' is the definition.
('exhume' can be a synonym of 'disinter')
'old philosopher' is the wordplay.
'old' becomes 'ex'.
'philosopher' becomes 'hume' (I've seen this in other clues).
'ex'+'hume'='EXHUME'
(Other definitions for exhume that I've seen before include "Reveal" , "opposite of 5 [ENTOMB]" , "Dig up (a corpse)" , "Disinter a dead body" , "Dig up, unearth" .)