Love city and kiss stone! (4)
I believe the answer is:
onyx
'stone' is the definition.
(thesaurus)
'love city and kiss' is the wordplay.
'love' becomes 'o' (In tennis, 'love' means 'zero').
'city' becomes 'ny' (I've seen this in other clues**).
'and' says to put letters next to each other.
'kiss' becomes 'x'.
'o'+'ny'+'x'='ONYX'
(Other definitions for onyx that I've seen before include "Marbled stone with layers of colours" , "Hard stone with coloured layers" , "Agate with different bands of colour" , "Kind of agate" , "Agate with alternating bands of colour" .)