Show up with former model (6)
I believe the answer is:
expose
'show up' is the definition.
(I've seen this before)
'with former model' is the wordplay.
'with' is a charade indicator (letters next to each other).
'former' becomes 'ex'.
'model' becomes 'pose' ('pose' can be a synonym of 'model').
'ex' put next to 'pose' is 'EXPOSE'.
(Other definitions for expose that I've seen before include "hazard" , "Reveal, uncover" , "Show up" , "brings out crime" , "Bring to light" .)