Wary about companion's carnality (7)
I believe the answer is:
lechery
'carnality' is the definition.
(thesaurus)
'wary about companion's' is the wordplay.
'wary' becomes 'leery' (I've seen this before).
'about' means one lot of letters goes inside another.
'companion' becomes 'ch' (I've seen this in other clues).
'leery' placed around 'ch' is 'LECHERY'.
(Other definitions for lechery that I've seen before include "Unrestrained sexual desire" , "Excessive sexual desire" , "lustfulness" .)