City that is against supporting King (4)
I believe the answer is:
kiev
'city' is the definition.
(I've seen this before)
'that is against supporting king' is the wordplay.
'that is' becomes 'ie' ('i.e.' can be a synonym of 'that is').
'against' becomes 'v' (abbreviation for 'versus'**).
'supporting' means one lot of letters go next to another (in a down clue, some letters go below others).
'king' becomes 'k'.
'ie'+'v'='iev'
'iev' after 'k' is 'KIEV'.
(Other definitions for kiev that I've seen before include "Capital city of the Ukraine" , "place in eastern Europe" , "Ukrainian city" , "Ukraine's largest city" , "Ukraine's capital - way of cooking chicken" .)