City captivated by caber-tossing? That's novel (7)
I believe the answer is:
rebecca
'novel' is the definition.
(Daphne du Maurier novel)
'city captivated by caber-tossing?' is the wordplay.
'city' becomes 'EC' (the City of London postcode).
'captivated by' is an insertion indicator.
'tossing?' is an anagram indicator.
'caber' with letters rearranged gives 'rebca'.
'ec' going into 'rebca' is 'REBECCA'.
'that's' is the link.
(Other definitions for rebecca that I've seen before include "Sunnybrook Farm girl" , "The first Mrs de Winter (Du Maurier)" , "She married Maxim first" , "Mrs de Winter (novel by D. Du Maurier)" , "One of the four matriarchs of the Jewish people (anglicised)" .)