Car going round the City in rally (7)
I believe the answer is:
recover
'rally' is the definition.
(thesaurus)
'car going round the city' is the wordplay.
'car' becomes 'rover' (former British car manufacturer**).
'going round' indicates putting letters inside.
'the city' becomes 'ec' (the City of London postcode).
'rover' going around 'ec' is 'RECOVER'.
'in' is the link.
(Other definitions for recover that I've seen before include "Find" , "Get better - get back" , "Rally, get better" , "Rescue" , "Bring back" .)