French city, former Olympic hosts cancelling field event? (5)
I believe the answer is:
lille
'french city' is the definition.
(I've seen this before)
'former olympic hosts cancelling field event?' is the wordplay.
'former olympic hosts' becomes 'Lillehammer' (Lillehammer hosted the 1994 Winter Olympics).
'cancelling' indicates named letters should be taken away.
'field event?' becomes 'hammer' (hammer is a kind of field event).
'lillehammer' with 'hammer' taken away is 'LILLE'.
(Other definitions for lille that I've seen before include "Industrial city of northern France" , "Stop before Paris" , "City of N. France" , "[FRANCOPHOBIA] would prevent you appreciating it" , "University city in French Flanders" .)