Former partner and I worried about my skin (9)
I believe the answer is:
excoriate
'skin' is the definition.
(thesaurus)
'former partner and i worried about my' is the wordplay.
'former partner' becomes 'ex' (an ex-partner).
'and' says to put letters next to each other.
'worried' becomes 'ate' (something worrying may eat someone up).
'about' is a charade indicator (letters next to each other).
'my' becomes 'cor' (both are expressions of surprise).
'i'+'ate'='iate'
'iate' put after 'cor' is 'coriate'.
'ex'+'coriate' is 'EXCORIATE'.
(Other definitions for excoriate that I've seen before include "Flay" , "roast" .)