Indiscreet kiss involving the French (8)
I believe the answer is:
careless
'indiscreet' is the definition.
(thesaurus)
'kiss involving the french' is the wordplay.
'kiss' becomes 'cares' (I am not sure about this - if you are sure you should believe this answer much more).
'involving' means one lot of letters goes inside another.
'the french' becomes 'les' (plural form of 'the' in French).
'cares' going around 'les' is 'CARELESS'.
Can you help me to learn more?
(Other definitions for careless that I've seen before include "'Heedless, unthinking (8)'" , "Inattentive to one's work" , "Sloppy" , "Cavalier" , "Lax" .)