Romance that's transformed in Paris hotel (12)
I believe the answer is:
relationship
'romance' is the definition.
(thesaurus)
'transformed in paris hotel' is the wordplay.
'transformed' is an anagram indicator.
'in'+'paris'+'hotel'='inparishotel'
'inparishotel' anagrammed gives 'RELATIONSHIP'.
'that's' is the link.
(Other definitions for relationship that I've seen before include "Connection, bond" , "Linkage; affair" , "Association, connection" , "Emotional bond" , "Romance" .)