Thrill old lover with quote (6)
I believe the answer is:
excite
'thrill' is the definition.
(thesaurus)
'old lover with quote' is the wordplay.
'old lover' becomes 'ex' (I've seen this in other clues).
'with' says to put letters next to each other.
'quote' becomes 'cite' ('cite' can be a synonym of 'quote').
'ex'+'cite'='EXCITE'
(Other definitions for excite that I've seen before include "Rouse feelings, make eager" , "Stir up, stimulate" , "Kindle" , "Give rise to (a feeling)" , "Provoke, animate" .)