Former model makes a revelation (6)
I believe the answer is:
expose
'a revelation' is the definition.
(I know that expose is a type of exposure)
'former model' is the wordplay.
'former' becomes 'ex' (prefix meaning former or onetime).
'model' becomes 'pose' (model can mean to pose).
'ex'+'pose'='EXPOSE'
'makes' acts as a link.
(Other definitions for expose that I've seen before include "Make visible or obvious" , "Unmask or denounce" , "Uncover or unmask" , "Reveal, uncover" , "Make visible or apparent" .)