City to compete with Norwegian sides by first of April (6)
I believe the answer is:
vienna
'city' is the definition.
(Vienna is an example)
'compete with norwegian sides by first of april' is the wordplay.
'compete with' becomes 'vie' (to vie with someone is to compete with them).
'sides' suggests removing the centre (only the letters on the sides are used).
'by' means one lot of letters go next to another.
'first of april' becomes 'a' (1st letter of 'april').
'norwegian' with its middle removed is 'nn'.
'vie'+'nn'+'a'='VIENNA'
'to' acts as a link.
(Other definitions for vienna that I've seen before include "somewhere in Austria" , "huge 20 [ULTRAVOX] hit" , "European capital" , "Austria's capital city" , "On the Danube, it was home to many great composers" .)