Spread of craze to cover North (5)
I believe the answer is:
range
'spread' is the definition.
(thesaurus)
'craze to cover north' is the wordplay.
'craze' becomes 'rage' ('rage' can be a synonym of 'craze').
'to cover' means one lot of letters goes inside another.
'north' becomes 'n' ('N' can be a synonym of 'north').
'rage' going around 'n' is 'RANGE'.
'of' acts as a link.
(Other definitions for range that I've seen before include "Old-style cooking stove" , "Cooking stove or place for target practice" , "Where to cook" , "spectrum" , "practise shooting here" .)