Heard they are banishing leaders overthrown in English city (4)
I believe the answer is:
bath
'english city' is the definition.
(Bath is an English city)
'heard they are banishing leaders overthrown' is the wordplay.
'leaders' indicates taking the first letters.
'overthrown' says the letters should be written in reverse.
The first letters of 'heard they are banishing' is 'htab'.
'htab' backwards is 'BATH'.
'in' is the link.
(Other definitions for bath that I've seen before include "cleaning unit" , "Roman Aquae Sulis" , "Avon city - tub" , "on the Kennet and Avon canal" , "Home fixture (for City?)" .)