City in bloom? A hamlet (5)
I believe the answer is:
omaha
'city' is the definition.
(Omaha is an example)
'in bloom? a hamlet' is the wordplay.
'in' indicates a hidden word.
'OMAHA' is hidden in the letters of 'bloom a hamlet'.
(Other definitions for omaha that I've seen before include "place in Nebraska" , "State [CITY!!!]" , "Nebraska's largest city" , "US 1944 D-Day landing beach" , "American town" .)